if you can afford it an oled screen tv anything apart from cheap makes including lg or if you cant afford that a samsung quantum dot tv as they have a 10 year screen burn warrenty included
Sony indirectly recommends 60" or larger to get the most out of it, from the Ultimate PS4 Pro FAQ:
"Unofficially, the staff of PlayStation.Blog has observed good results in average living rooms with 4K TVs sized 60’’ and up.
If you’re in the market for a new 4K TV for PS4 Pro, we strongly recommend selecting a model with HDR10 compatibility, which will enable increased image vividness and contrast in HDR10-enabled games and movies."