For most humans the difference between a 120Hz and 60Hz display is not noticable. If you plan to play fast paced, competitive games a 120Hz display might be more suitable.
A display capable of 4k HD provides a sharper and better image, if your plattform is capable of providing such images. However it is also more expensive and generally more energy consuming. 
Choosing such a display might depend on a lot of other factors as well, for example budget, personal preference, avaiable room etc.
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