The answer is personal preference, watch videos and play the game.
I enjoy having different companions in my party at different times, and companions can have different reactions to the others that make it interesting. I plan to have all companions play out their story arcs from august...and if i want a break ill do a hireling playthrough.
To be confirmed...but looks like we might keep all companions into act 2 and can change their class. That will prevent the "i want one wiz in my party, and thats me, therefore i will never have Gale in my party" syndrome.
