My favourite is Wind for no particular reason. It's like how sometime your really, really, hate someone, or something. The reason is probably because I'm always standing around in the wind, and I enjoy it...
lol I was all set to say antimony (anti-money) from the title but forest I guess. I just thought about what brings me the most peace and the woods felt right.
I choose fire I don't really know why but I think it'd be super cool to control fire, well any element would be awesome, but fire's at the top of my list.
Fire. Burning and explosions give me a strange pleasure. second would be wind. If I had the power of both, you could be that fire tornados would become a thing.