I can't make that decision for you but I do own both pairs so here's what I think about them:
The EQTs are actually built much, MUCH better while the RBs are considerably lighter because of the neoprene upper. Both shoes are ridiculously comfortable but if I really had to pick one I'd take the EQTs, ankle support on the EQTs is super plush and the woven upper is just fantastic. The RBs do have the Y3 branding going for it which is cool and all, I suppose. Without it, you'd have a heck of a hard time selling a shoe with a neoprene upper for 200--300 bucks. It is a very well-constructed shoe, don't get me wrong, just...ehhhh, that neoprene.
As an aside, I think it's fantastic that Adidas is spoiling us with these choices. Between these kicks and the UBs I think it's safe to say Adidas are firing on all cylinders. The Boost platform has no comparison, none at all. I recently got a pair of Flyknit Racers in as well and I was quite surprised how poorly they fared next to the UBs.