It's surprising to me with the advent of retina screens that there are so few narrow options (M+ is the only one I've seen). Aesthetics aside (although M+ is quite pleasing to the eye), I think the narrowness functionally =is= better.

However the line height is quite tall which I'm not sure is an attribute of the font or text editors. TextMate still inexplicably has terrible line height management (you have to mess around with 2 terminal command settings).