Actually, there is a compatibility problem between them. I use them both together in my profesional developments and they work great except for one thing.
You cant use the thrive content builder in the GeneratePress Sections. The content created with TCB is shown in every section, duplicating the content. I have not found a way to show just a piece of content in each section.
Sections is a simple, standalone page builder. It’s not really capable of working with other Page Builders because of the functionality (repeating editors etc..) – at least it’s not intended to.
It’s mainly for if you don’t need the complexity of a Page Builder, but just want to add full width sections.