>>412430554
Depends on what you're playing and how much the cards cost for you.
3090 seems like enough for VRC and most VR stuff right now. 3080 is close enough in performance that if you didn't need the extra VRAM, it'd be the better buy.
4090 looks a lot better for certain sims that don't perform well in VR.
I wouldn't bother with the 4080 though, it's in a weird middle ground where it doesn't make a lot of sense right now.