I'm thinking to sell my 27inch 4K monitor to buy 43inch 4K TV because i believe i will have a better experience with video games (play on PC and PS4) and movies with a larger display. What are you opinions is a good idea or not?
TVs require an HDMI 2.0 video card to work with 4k so you will need the PC to have that. Otherwise you will be limited to 1080p.
In the past when I've used a TV as a monitor I found it really annoying if the TV would overscan the desktop losing content at the edges of the screen. I would suggest you check the owners manual of the TVs to make sure that there is a mode that lets you turn that off. It may be called 1:1 or some other name.