People ride with different bars because they look cool to them. I've got bikes with regular drop bars so my next project will have Nitto Albatross bars. Why? Why not.
I thought about bullhorns because they are very similar to riding on the brake hoods of regular drop bars but then I saw the Albatross bars and figured I'd give them a whirl. The Albatross aren't as curvy as moustache bars; you can move your hands around more on the bars.
Bars are easy to swap out, so don't feel like you have to choose one style.