If you don't have a preferred room, your choices are really Love Bug and Mighty Ducks.
Love Bug is a lot quieter because it's at the back of the resort and not near a pool. It's also a shorter walk to the main building than the Mighty Ducks.
The Mighty Ducks is by their quiet pool, and there's a lot less noise and activity there than the main pool. The Ducks rooms are actually closer to All Star Music's bus stops and main building than the Love Bug's is.
The preferred buildings are 101 Dalmations, Toy Story, and Fantasia. You can actually request these rooms even if you did not pay for a preferred. But you'll only get one if they have availability and open rooms there, as paying preferred room guests get these rooms first.
If you did want to chance it and try for one of them, I would pick Toy Story because it is the quietest, very close to the bus stops, and right near the main building.