I picked 34" Ultrawide. It works just fine for everything. Easy to read, almost two "regular" monitors worth of screen space. Gaming on 3440x1440 is hard to max out (but easier than 4k), but you barely notice the difference between 3440x1440 and 2560x1080 in most games.

I actually quite like the aspect ratio - it means I can have 2 windows in normal proportions (IDE for example) and another one on the side (terminal for example)

1 thing to note; I thought 34" Ultrawide will be bigger screen than it turned out to be.