Take a look at this, Founders Editions of a 5070, 5080 and 5090 vs a selection of 3rd party cards...
The FE coolers come in last every time when it comes to cooling performance but they all only take up 2 slots where most 3rd party cards are 2.5 to 3+. This is great if you've got a small matx/itx build but if you've got anything larger then you might as well take advantage of a larger cooler to get lower temps and, probably, noise. Also take into account the cost increase above the FE cards for these improved temps. For example an Asus Astral 5090 costs £800 above the price of a 5090FE.