Now that I have a 4090 in-hand, I would answer the original question with “4080, most definitely.”
The 4080’s going to give you the DLSS frame doubling. (And despite what some are complaining about, I see no noticeable artifacts there with my 4080.) And the base performance is a bit faster than the 3090Ti.
As far as brand goes, I ended up with MSI. Good support over the years, good quality.