I use a Dell display with a Mac mini with no problems.
A very common issue is users wilfully setting the resolution to lower than the LCD monitors genuine resolution so as to make text 'bigger'. This results in the computer and monitor having magnify each pixel so instead of an exact 1 to 1 match which is pin-sharp it might be that it is something like 1 to 1.5 and it has to approximate things which results in it looking less sharp. The number of times I have told users this would happen and they have ignored me and then complain about fuzzy text.
Unlike the old CRT type displays of days gone past LCD monitors have a single 'real' resolution. Going back to our Dell monitors I mentioned we use they are 1920x1080 pixels in resolution, if you have the 24" version of this screen some users complain the text is too small - partly exacerbated by having the screen to far back on the desk. They can set the resolution lower to give fewer bigger pixels but then as mentioned these pixels are not an exact match to the physical pixels of the LCD and have be approximated. The only real solution is a bigger screen with bigger pixels.
Now saying all the above Apple also have another approach which is to separate in software the resolution of the 'screen' it works with in software from the physical screen. If you have a higher enough physical resolution display i.e. a 'retina' display then the Apple software can operate in what Apple called HiDip. In this special software mode the Mac still sends the 1 to 1 match of pixels but some elements are first drawn in the software screen at a different resolution i.e. things like text and dialog boxes etc. - photos are not affected they are left at 1 to 1 at the full maximum physical resolution.
So if you have a suitable extremely hi-res screen e.g. a 4K or 5K screen you can take advantage of this and set your Mac to 'bigger' text without adversely affecting the resolution. Otherwise if you have a traditional resolution screen e.g. 1920x1080 or 1920x1200 then you should leave it at the 1 to 1 resolution to avoid fuzzy text or buy a bigger screen e.g. a 27" but at the same resolution so the pixels are bigger.
Note: Only recently did Dell release a 27" 1920x1080 screen, the typical trend is bigger screen mean more pixels, rather than bigger pixels. There are very few 27" computer LCD displays of 1920x1080 it seems.
Finally TVs used as computer displays while you might think should give equivalent quality if the same size and resolution do not. This is because TVs are designed to optimise moving video style images and not static text style images.