Both are good, if you are going for RTX3090 make sure you buy better brands with three fans and good thermal pads tweaks, you can watch youtube videos about best RTX3090 cards available on the market, I just find the 1660 Ti and super to be extremely quiet and cool
LOL if you pack 1660ti together they ain't cool no more and you can add the trouble of managing 4 pieces of them.
go for 3090..what is this bull market for?