Here are 2 different page builders for WordPress that fill 2 different needs.
The feature set that comes with Divi, like their header/ footer builder, style-sync, etc, are just better for full site builds.
On the flip side, Thrive Architect has modules that are very equivalent to Divi, but some better for marketing.
A perfect example is timed content, countdown timers, popup boxes, etc.
Also, Thrive Architect is part of a larger family of plugins that all work in perfect harmony, much like Apple devices.