RBR750 Replacement - What did you move to, and what worked best?

I've used lots of different systems. 

RBK750, RBK50, RBK43, SXK30

And router plus extenders,

RAXE500, RAX200, CAX80 (plus more). 

I still end up going back to the mesh systems. Not the RBK750 system but to my SXK30 system that i have setup with a wired backhaul. 

the business side tends to be more stable and you can modify more systems. 

I usually use a router like the RAXE or RAX200 as the primary and set the mesh up in access point mode for overall coverage. 

That way I can have something with peak performance (close to it) but yet cover my whole home and part of the outdoors. 

Gets a bit spendy but it works well for me. 

I've tried it with just the flagship routers and extenders but you don't have as smooth of roaming.