Full control or let them roam?

Mix of both. But I like micromanaging things for the most part. I like some randomness like when two sims start arguing out of nowhere. TS4 needs better AI here because I barely see it in the game. The other day Don randomly hit on my married sim at work because he got flirty. I thought it was so amusing. It almost never happens I don't know what programming they did there. Or if it's emotional dependant but NPC sims are almost always happy and that's why I don't see it, I don't know.

But it really depends on the scenario. I'm not about to generalize and say it's all one or the other. I especially hate leaving everything to the sims, especially on TS4 where nothing ever happens, for the most part.