BEST 4K TV for a budget?

I've been looking at 4K TVs for someone and they've given me maximum budget of £699

could someone please recommend me the BEST 4K TV that I can get with £699 that is 55" or more

so far I've got these on the list
richersounds.com/tv-projectors/sony-tvs/sony-bravia-kd55xh8196bu.html

richersounds.com/philips-65pus8555.html?refSrc=70070&nosto=productpage-nosto-5

richersounds.com/tv-projectors/lg-tvs/lg-55nano866na.html


thank you

edit:

1080p upscaling (Freeview stuff I guess)
Netflix
YouTube
Prime Video

I'm not sure which TV brand abandon their software quick so would like to avoid that if possible.

Snappier App loading would be ready useful.