1920x1200 is probably marginally better supported than 1920x1080 due to a few older games with hardcoded resolutions, but even then, 1920x1200 is a realtively 'new' resolution in itself, if you go back 8 years or more you may not even find support for that in some games.
Pretty shocked actually to see 1920x1080 is now the most popular screen on Steam surveys, thought it would be less than that when you consider the pretty poor standard of hardware people tend to have by enthusiast standards (~59% of people have fewer than 3 cpu cores, ~49% have 512MB or less VRAM, ~75% have less than 1TB total HD space, over 50% have under 4GB RAM etc)