I have a 17" (Compaq MV740), 19" (HP 91) and a 21" CRT (Sony G500).
The 17" is the most recent acquisition, and I switched the 19" I was using for DOS with my 486 with it. I always liked big screens, but the 17" is definitely a better fit for DOS resolution, makes everything look just a bit more sharp, even if I wasn't complaining with the 19" either, it was perfectly fine.
I'm using the 21" with a VGA switcher with my P1 and P3 builds, both Win98se. Even for late DOS games, the 21" Trinitron is great.
I'm lucky to have a game room where they don't move, Hezus' point about hauling big ass CRT's around is fair 😀
Granted, I like "big" screens, I've never encountered anything that resembles eye fatigue as I've been spending many hours a day on screens for 35 years both for leisure then work, the usual recommended distances in relation to screen size (both computer and TV's) never made any sense to me and I've always been way closer than that, and my eyesight has never suffered from it 😁 I've always been slightly shortsighted but only wear glasses when driving for comfort, and that's it.
Not trying to boast or anything and hope it doesn't come that way, what I mainly saying is that the concepts of "eye fatigue" and "proper distance" are nothing but alien to me so I like to sit close to big screens!