For me, kind of a mix. I definitely don't min/max power game, but I do like to have a dominant role in a party. For me the fun is in becoming powerful and I find it more plausible for my character to be very good at everything with an important but less strong party supporting. Whilst I will aim for strong combinations and builds I will always bake in certain weaknesses - for example in EA I mostly play Warlock/Sorcerer and have very high DEX/CHA but will dump CON to compensate. Where there are unusual or particularly strong build choices there has to be an RP justification for them, not just "because it's really good". Because of this I gravitate towards games with a great deal of depth and complexity because it helps you to feel involved. Shallow games just don't hold interest for very long at all...