I cannot speak for 4K TVs, but as I was making a research for my own purchase I found the following differences between monitors and TVs.
TVs are said to be configured to display the best-looking colors, monitors try to stay true to the real color.
TVs have an immensely higher refresh rate, 50hz/60hz usually suffice for a TV. But on monitors we speak of milliseconds. The refresh rate makes a lot of difference, if you intend to game on your computer/monitor. An e-sport professional Redittor claims he had improved his playing performance multiple-folds after switching to a monitor instead of TV. (https://www.reddit.com/r/FIFA/comments/5whb9v/did_the_change...)
Other than these differences and the occasional overscan/underscan problems on older televisions, I personally see no reason to prefer a Monitor over a TV, if there is huge price difference. If the price difference is minor, I'd opt for a monitor.
Refresh rate and response time are different. Refresh rate is how often a new frame is displayed, i.e. 50/60/144Hz. Response time is the amount of time it takes for the display to process a frame and display it, i.e. 1/2/4/16ms.
>>Over a decade has passed since the LCD monitor unceremoniously ousted the boxy CRT monitor into obsolescence, but with that ousting came a small problem: CRT monitors redrew every frame from scratch, and this was baked into the fundamentals of how PCs sent information to the screen. Monitors redrew the screen with a refresh rate of 100 Hz, (100 times a second), and they were silky smooth.
>>LCD monitors don’t have this problem, because the pixels don’t need to be refreshed.
Instead, they update individual pixels with new colors, and each of those updates takes a certain amount of time depending on what the change is.
The response time refers to how long this change takes. LCDs started with a 60-Hz refresh rate but a response time of about 15 milliseconds (ms).
There's also factors like input lag that are separate from display refresh that can be a problem for people playing action games. Even casual players can notice some high input delay from time to time (we're into the 100ms+ range) so it's a good idea to check the display's input lag if games are anywhere near a possibility. While I like my 34UM95P for professional purposes it's really not that great for games that are much more than interactive movies. In contrast, nothing stops me from using an Acer x34 monitor for coding 95% of the time.
TVs are said to be configured to display the best-looking colors, monitors try to stay true to the real color.
TVs have an immensely higher refresh rate, 50hz/60hz usually suffice for a TV. But on monitors we speak of milliseconds. The refresh rate makes a lot of difference, if you intend to game on your computer/monitor. An e-sport professional Redittor claims he had improved his playing performance multiple-folds after switching to a monitor instead of TV. (https://www.reddit.com/r/FIFA/comments/5whb9v/did_the_change...)
Other than these differences and the occasional overscan/underscan problems on older televisions, I personally see no reason to prefer a Monitor over a TV, if there is huge price difference. If the price difference is minor, I'd opt for a monitor.