I've noticed in my gaming group that some players gravitate towards certain classes or roles.
Arcane caster, any kind of caster, fighter, thief - it seems most players have character types that they feel most comfortable with.
As for myself, I tend to GM more much more often then I play. When I do play, I'm willing to fill any unfilled role the party needs - and if the needs are filled, I'm looking to play a bard or some other class / class combo that can fill multiple roles as they come up. I don't THINK I have a preferred class, but if I did, it would be the "jack of all trades" type of character.
Do you have a favorite class or role to play in a party?