Video Help with buying a TV 39-42"

Hey guys,
Back to TE after a long time, needed some sound advice from you experts out there.
SO as the title suggestsd I'm looking to buy a new TV for my office table.
Viewing distance will be around 4' ( 1.3m) and the size that I need is around 39-42"

My primary use is to connect a PC and use it for viewing Autocad drawings and some other files.
I will also connect DVR and STB to this to see TV once in a while(not important).

My question to you guys is that I've seen some budget 4k TVs and FHD Tvs, what is the difference between these micromax, intex ones and the sony, samsung ones? and whether I should buy the cheaper ones or not?

I would appreciate if you guys gave me technical reasons or facts rather than saying its just better in all aspects.

Thanking you in anticipation.
 
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