If you have a PS4 or XB1 console then I would reccommend a TV that has at the very least a 100Hz and preferably higher refresh rate. Yes you will pay a llittle more but if you like fast paced games then you wont regret it.
It is pointless comparing a HDTV (1080p) to a UHDTv (4K) unless you are equally comparing brands. sizes and features. Sure screen resolution is important however for gamers refresh rates are or at least should be an important factor as well.
When comparing 1080p to 4K it is important to note that there is very little content for 4K while 1080p is well suported and if you have a current generation console 1080p is good enough even for BluRay movies and TV shows. Another thing to consider with 4K TV's is the fact that 8K displays are actually due out this year and while initially expensive they will drop in price (2 to 3 years) to the point where 4K is sidelined, sort of like 720p to 1080p.
