I normally choose whichever has the biggest weapon. I mean, I don't care for regular swords, but broadswords are pretty cool and if there is a giant hammer or axe I am all over that. One reason being that I find the image of a slim female character representing myself wielding a giant weapon to be hilarious. The other and more dominate reason is that I am extremely bad at aiming at things when I'm not in a first person perspective. Give me a ranged or AoE attack and I will give you five dead fellow party members.
Oh, and hitting things is fun.