We Recommend:

We Plugged The Numbers And, Based On Your Responses, We've Determined That Thrivecart Pro Meets Most Of Your Criteria!

Purposely designed to focus on one-page sales funnels and checkout pages (simple and purpose-built to be the best at those 2)
One-time price - No monthly payments
Simple Drag-N-Drop editor
Hosted on their servers so there is next to no downtime
A/B split-testing is a standard feature
In-depth analytics and reporting
Zapier integration so that it connects with pretty much any tool
Great / Quick customer support response time
Amazing support community in their Facebook group
Device-specific styling - show/hide elements based on desktop, mobile, or tablet
Constant updates (multiple per week)
Pro version has affiliate management, dunning, and automatic tax calculations
Pro version has the ability to add more users

Higher upfront cost (but no ongoing monthly cost)
Not designed as an "all-in-one" page builder - Focused around simple sales pages and checkout pages
Can't build opt-in pages with Thrivecart
If you cancel, you lose your pages since they are hosted on their servers
Not perfect for developers who want to inject custom codes and scripts