Do you prefer story characters or generics to use for your main party? If you prefer story characters, which ones? If you prefer generics, are there any classes you always use?
I prefer generics, and it is largely aesthetic (generics' appearances change with their job). I sometimes use Mustadio (guns are awesome) and Orlandu, though.
For my party, I change it up a lot. However, I almost always have a Wizard/Time Mage hybrid, because I love magic. Also, in most of my games Ramza has a similar progression of jobs: Monk -> Ninja -> Knight (later in the game). My other characters can vary wildly. In some games I won't use Calculators, because they can use any and all magic abilities they learn, which I think takes away from the variety of a party.
Discuss your battle parties.