I usually take air and earth.
I find air to be a little more useful (haste is more useful than slow during siege).
Water could also sometimes be useful for the bless spell (for Dungeon in particular).
I don't usually take fire.
I think I like air the best, I like light floaty flying things, I think of myself more as a mind/spirit than a body. When I think of air I think of clouds and daydreams and magic and easy-going freedom, I think of light and white/pastels.
I like 'earth' when it's depicted more about green growing things than about rocks, I like green and brown together, but I don't relate to just brown/grey rocks being solid and strong
I do also like water, buuuut it's too blue for me, it feels a bit cold and depressing, though it can also feel refreshing and tranquil.
fire I really don't relate to, too hot, too chaotic, too scary, too orange