Monitor with a set top box vs tv for watching tv. which is better value?

Update: whats the drawback of using a monitor instead of a tv. i might connect a desktop to it in the far future like in a year or two. im deciding on just buying a tv or buying a monitor and a set top box for my room. i dont want something too big cause i dont have a lot of room.
Update 2: im not that interested in 4k either. it seems like a waste of money. 1080p is more then enough for me.
Update 3: im planning on connecting a cheap desktop to it when my laptop fails. or i get sick of it.
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