I’ve owned a Seiki 4K monitor (39″ @ 3840×2160), an Apple Thunderbolt monitor (27″ @ 2560×1440) and an ultra-wide, 21:9 aspect ration LG UM95P (34″ @ 3440×1440) and now this one. This one wins. 27″ is a bit too small and anything over 34″ is a bit too big. 32″ is perfect.
https://www.amazon.com/Samsung-LS32D85KTSR-ZA-32-Inch-LED-Lit/dp/B00L3KNOF4