I too prefer the 21:9 for my desktop. I do notice that you really should mount it higher than I would normally to make feel more comfortable. About 2x what an iMac has for height.

In laptops, I miss the 4:3, and find 3:2 acceptable. I guess I want more square inches of screen. I keep seeing these laptops with 16:9 with a friggin numeric keypad interferes with proper centering.