I would look at it based on warranty & service. Overall I'd say the Gigabyte 3-fan looks good because you get all 3 years with OCUK in case of issues and they have UK RMA anyway, so it gets dealt with quickly. It is £30 above the cheapest though. Cooling wise they're all quite similar, it will depend on the noise you can tolerate, none will be obnoxiously loud like old blower cards.
https://www.overclockers.co.uk/giga...ddr6-pci-express-graphics-card-gx-1b3-gi.html
And yeah, you can definitely get away with it at 4K with settings tweaks. I can't tell you how many times you can get +50% performance from changing settings to ones which barely look any different but give you back so much. And in some cases the difference from 4K to 1800p is also very small, so that's a boost as well. Plus the future is temporal upscaling anyway, so that's gonna be featured more & more as time goes on.
I also play on 4K TV but with a V64 in my case. It's honestly fine, and for a 2070S you'll do great.