It varies. I'm torn honestly. Do thunder/lightning/electric things fall under Air? Meh, deserves it's own category I say! It's rather destructive and quite fun after all. And not as over-used as some of the others may be. :P
Well, all of the elements have their pros and cons.
I usually just chose my horoscope elements. :3
By palm reading, my element is fire (because my fingers are about the same length as my palm). But, my zodiac is of the Earth element (Capricorn).
They're both good. I think that Earth is probably most representative of my personality, though. ;3