I voted telephoto, because that's what I use most often with my DSLR. I'm unlikely to get a pro, I never have (currently 13 mini), so this question really does get right to my own wants as a consumer. But there are three things I do consider that might actually argue against the telephoto:
(1) I don't expect it to be strong enough to make me not want to use my DSLR when I need to be in close. I bought a Sandmarc 2x external telephoto lens to use with my mini, and though I like the improvement it isn't enough for my needs.
(2) I like the effect of the ultra-wide when photographing something at normal distance; I dig the perspective-warping it does.
(3) Isn't it the ultra-wide lens that the iPhone uses for macro? At least, the iPhone pro? That's something I hope comes downward within a couple of generations of the new phones, instead of remaining pro-level.
And just like that, I've changed my mind!