Ask YC: jQuery vs Prototype

I'm curious what people here use for their projects, especially ones making heavy use of javascript.

I recently started doing a lot of JS and found prototype to be a lot more useful. I've used jQuery only a little bit, but Prototype v1.6 seems to be able to do everything jQuery is good at (DOM traversing and manipulation) and has other useful things like a extended arrays, hash maps, ranges, classes/inheritance etc.