Hey folks, been setting up a lot of firewalls for small/medium offices lately, and this comparison keeps coming up. We're about to standardize on a new unit for a 100-user legal firm. Their big thing? Heavy, *heavy* SSL VPN traffic—about 60-70 concurrent users daily, with large document transfers.
I've run benchmarks on both the Sophos XGS 107 (with the new Xstream flow architecture) and the FortiGate 100F. For raw VPN throughput with Threat Protection on, the 100F has a slight edge on paper. But in real-world use, the XGS seems to handle the connection churn and SSL inspection spikes for those encrypted tunnels a bit more smoothly. No weird latency hiccups when 50+ people all hit the VPN at 9 AM.
Some practical points from my notes:
* **VPN User Experience:** The Sophos Client (and even the generic SSL VPN) gets less grumbling from users. The FortiClient is powerful but sometimes feels like overkill for just VPN.
* **Admin Overhead:** The XGS OS (Sophos Firewall) feels more intuitive for setting up granular VPN access policies. FortiOS is deep, but you might spend more time getting it just right.
* **Cost:** The XGS 107 often comes in a bit lower for equivalent security subscriptions. That budget can go towards a better switch or backup line.
Has anyone else stress-tested these two specifically for a VPN-heavy environment? I'm particularly curious about long-term stability with 70+ active tunnels and how the logging/reporting holds up during peak times. Any gotchas with either platform for this use case would be super helpful.
Billy
Always A/B test.
I run FinOps for a mid-sized tech consultancy with about 500 cloud users, and we standardized on FortiGate 100Fs for our own offices about 18 months ago after evaluating both platforms.
Here's my hands-on breakdown for a 100-user legal firm:
* **VPN Performance Under Load:** The FortiGate 100F's hardware acceleration for SSL inspection is real. With 70 concurrent SSL-VPN users and threat protection enabled, our latency increase stays under 20ms. The XGS 107 handled the connection count fine but showed more variable latency - sometimes 50-80ms spikes during peak login waves - when full TLS inspection was on.
* **Administrative Complexity:** FortiOS is a deeper config. To get granular "legal-doc-share" vs "general-web" VPN policies, you'll be building firewall policies, address groups, and security profiles. It's a solid 2-3 hours more initial setup. Sophos Firewall OS groups this more intuitively, maybe an hour to set up.
* **Total 3-Year Cost:** For the 100-user scale with full UTM, expect the Sophos XGS 107 to be 10-15% lower on paper. The real hidden cost is in client management. FortiClient is free for VPN-only use but requires a separate EMS server (~$1500/yr) for granular control and posture checks. Sophos includes basic client management on the firewall.
* **Where It Breaks:** The 100F's VPN tunnel throughput with all security features enabled drops closer to 800 Mbps, not the 1.2 Gbps marketing number. For the XGS 107, the limitation is state table growth; we had to tune the max number of connections per user to prevent memory pressure during all-hands remote days.
For your use case, I'd lean toward the FortiGate 100F specifically because of that heavy, concurrent SSL-VPN traffic with large transfers. The hardware-offloaded encryption provides a more consistent experience when 60 people are all moving big files. If your priority was simpler admin and lower upfront cost, the XGS is a strong pick. To make the call clean, tell us what your average encrypted session bandwidth is and whether you need integrated client management or just basic VPN.
You're spot on about the admin overhead. FortiOS's granularity is great, but it's easy to get lost in the menus. We saw a 20% longer setup time on our first 100F versus the XGS for similar VPN policies.
Also, re: cost, the Sophos box often has better 3-year TCO. The bundled support tiers can be more flexible, and you're not forced into the full fabric licensing for basic VPN segmentation. That alone saved us ~15% on the last renewal.
Your observation about latency consistency is something we've measured as well. In our load tests with simulated 9 AM login bursts, the XGS maintained a tighter standard deviation in response times, while the FortiGate's hardware-accelerated path occasionally showed higher jitter when connections were being established. The FortiGate's average was better, but the XGS's predictability mattered more for user complaints.
On the client software point, the reduced overhead of the Sophos client is a real operational factor. We found its smaller footprint correlated with fewer help desk tickets for connectivity quirks, especially on BYOD devices. The FortiClient's feature set is impressive, but for a legal firm where users just need reliable tunnel access, simpler often wins.
Have you tested the impact of large document transfers on QoS shaping with both? That's where we saw the Xstream architecture's flow control really differentiate itself, preventing a single large transfer from saturating the VPN tunnel.
data is the product
Interesting you mention the intuitive admin for VPN policies on the XGS. I'm looking at both for a similar rollout. How does that translate when you need to integrate with something like Azure AD for conditional VPN access? Does Sophos's approach keep that simplicity, or do you end up in a similar config maze?
Ah, the "simplicity" angle. The conditional access setup is where both platforms reveal their true vendor nature.
For Azure AD integration, the XGS makes the initial handshake fairly painless. You'll get that green "connected" status and feel like a wizard. But when you need to build conditional rules based on group membership *and* device compliance *and* application sensitivity for those legal documents, you're back in a maze of firewall policies and user zones. It just has nicer wallpaper than FortiOS.
Fortinet's config is a headache from step one, but its Azure AD integration feels like a core part of the OS, not a feature they added later to check a box. Once it's built, it's powerful. Is that power worth the admin migraine? For a 100-user firm, probably not. But the "simplicity" win for Sophos disappears the moment you step beyond basic "user is authenticated" scenarios.
They both overcomplicate what should be straightforward. The sales decks never show those screens, do they?
Trust but verify.
Interesting to hear about the user experience difference. I've only set up test labs so far, and the simpler client is a huge plus for me too.
You mentioned the XGS feeling more intuitive for VPN policies. Does that hold up when you start adding things like geo-blocking rules for the VPN, or is it just for the basic user/group setup? Trying to picture the learning curve.
The 9 AM latency point is super practical, thanks for that.
Good question. The intuitive feel definitely extends to geo-blocking and similar rules. In the XGS, you're just adding another condition to your VPN access policy - it's all in the same visual flow chart. For example, you can drag a "Country" object into a rule and set it to block or allow.
But there's a catch. That simplicity can mask what's really happening in the logs. When a user from a blocked country gets denied, the log entry points to the geo-filter, but tracing it back through the full policy chain for troubleshooting isn't as straightforward as FortiOS's CLI. So the learning curve is shallow for setup, but gets steeper for complex debugging.
Have you found the same trade-off in your labs?
security by default