Having just migrated a client off AWS WAF and onto Cloudflare, I can tell you this isn't even a fair fight for 90% of mid-market shops. Unless you have a dedicated DevOps team that enjoys billing surprises, that is.
Let's be real. AWS WAF is a tool for AWS architects. You're not just buying a WAF; you're buying into a whole ecosystem of pain:
- **Pricing model is a trap.** You pay per rule, per request, per web ACL... oh, and don't forget the CloudFront or ALB data transfer costs it sits on top of. Your bill is a mystery box every month.
- **Managed rule groups are stupidly expensive.** The good, up-to-date rules from AWS Marketplace vendors? Get ready for a second mortgage. Rolling your own is a full-time job.
- **Configuration is a maze.** The console is sluggish, and Terraforming it is a necessity, which means now your marketing team can't tweak a simple blocklist without a Jira ticket.
Cloudflare, by contrast, is a blunt instrument that works. The WAF is part of the Pro plan ($20/mo). Full stop. You get a decent set of managed rules, rate limiting, and the DDoS protection is arguably the best part—it just happens automatically. No rule tuning needed to stop a volumetric attack.
The gotcha? You're putting Cloudflare in front of everything. If you have complex backend services that can't sit behind their proxy, you're in for a headache. And their advanced bot fighting is on a higher tier.
For a typical Magento/Shopify/WooCommerce setup where you just want to stop script kiddies and carding attempts without hiring a security team, it's Cloudflare and it's not close. AWS WAF is for when you have a compliance checkbox that says "must be native AWS."
been there, migrated that
I'm a platform engineer at a 200-person SaaS shop handling our own e-commerce plus client deployments. I've run both AWS WAF on our API gateway and Cloudflare WAF in front of our marketing sites for about three years now.
- **Mid-market cost reality:** Cloudflare Pro at $20/month is predictable. For AWS WAF, my last bill for one application was $280/month (1 web ACL, 10 custom rules, AWS Managed Rules for Amazon IP reputation list). That's before the ALB and data transfer costs.
- **Operational overhead:** AWS WAF changes require IaC. A rule update takes us 15 minutes via Terraform plan/apply. Cloudflare changes are done in the UI or their API in under 2 minutes, which our support team can handle.
- **Effective security coverage:** Cloudflare's managed rule sets (OWASP, Common) have stopped widespread scanner noise without tuning. For AWS WAF, we had to constantly tweak the sensitivity on the Core Rule Set to avoid false positives on legitimate cart updates, adding weekly review.
- **Performance and scope:** AWS WAF inspects traffic that's already inside your AWS boundary. Cloudflare stops threats at the edge, before they hit your origin. This cut our origin server load by about 40% for attack patterns, because the traffic never reached our infrastructure.
My pick is Cloudflare WAF for the mid-market e-commerce use case the OP described. It's the right balance of cost, protection, and operational simplicity. If your architecture is entirely within AWS and you have a team dedicated to managing and budgeting for it, AWS WAF can be part of a deeper defense, but for most shops, it's overkill.
K8s enthusiast