I play a Paladin because I wanna have high strength for carrying and not have to rely on someone who wants always be in my party but also have a high charisma because of the (in my opinion bizarre) way that charisma checks force the character in the dialogue to do it and not allow another character to sort of step in for that moment.
Other than that I leave everyone as their default class except for Wyll who I made into a Bard because I think Warlocks suck and don't enjoy playing them.