should I choose a tv over a monitor
yes, for anything larger than around 32" based on current pricing and...
computer monitors are generally 32" and smaller, come available with more connection types especially DisplayPrt (DP) and often include HDMI. They will be designed having a stand and sit around 3 feet from your eye. For a 4k resolution you are required to use either DP or HDMI connection.
my opinion: I have a 32" 4k LG computer monitor and while it is very nice, it's almost too big having all that screen and brightness in your face. So much so I think I like my old 27" 2560x1440 monitor better on my desk between one and two feet from my eye.
The TV's with 4k being common today, are all something like 42" and larger, and are most certainly more economical. There is little if any reason to not use a 4k big screen tv now as a computer monitor provided you can make use of HDMI; the tv's are likely to not come with DP and for 4k resolution you then must use HDMI. If your computer doesn't have HDMI but only DP, then you will be using a DP-to-HDMI adapter to make use of an HDMI cable to the tv. Again, this is for 4k (3840x2160).
Computer monitors are more designed around sitting on a desk within 3 feet of your face, whereas a big screen tv is not necessarily comfortable at such a close range and it's stand might be a little problematic but that's something a user could easily manage if they have the desire to. Everyone basically plays nintendo/xbox/playstation connected to big screen tv's. If response time was a significant issue for "gaming" it would be known, there is no response rate problem with good 4k tv's today. The color setup and picture controls on tv's I think have surpassed what is offered now on computer monitors; picture is probably better on 40+ inch big screen 4k tv's now than computer monitors. With the response rate and gaming, the big debate is does one really need 1-2ms response time of a TN type panel (sacrificing picture quality) or is the < ~6ms response time just fine. Back when big flat screen's were first coming out having > 10ms response time then one might argue it's likely a problem for hard gaming but certainly not for typical use. The refresh rate is another matter and basically a non issue; they will be either 30, 60, 120, or 144 Hz.
I am sensitive to bad screens - flickering, light bleed, fuzziness, blue lights etc, so comfort is an important factor for me more than refresh rate or color accuracy
suggest you test drive tv's at walmart/bestbuy/pcrichards/wherever to see how you can adjust them to meet your needs having the screen however many feet from your face.
big screen tv's 50" and larger work great in an office setting displaying powerpoint and video but typically 10 feet from anybody. Absolutely no reason you cannot use one like you mentioned.
Ideally you want a screen capable of a 60 Hz refresh or larger. Many good 4k big screen tv's come with at least a 60hz refresh rate. A 55" samsung UN55NU6900FXZA for $360 for example.