16:9 monitor is only acceptable for watching movies in my opinion. I cannot believe people are working on TV screens. I mean you can also code on a Commodore 64 in theory, but why would you?
Historically 16:10 monitors have had the same width as 16:9 ones (e.g. 1920×1200 vs 1920×1080) so there's no difference as far as having things side by side.
