The best one I was ever in was in Tower 2 lakeview. Great views of Illuminations, Magic Kingdom, and Hollywood Studios fireworks plus the gorgeous lake (the Epcot and Magic Kingdom fireworks were in the distance, though). I was also in the Tower 2 parking lot view - terrible room overall - lots of maintenance needed and the parking lot isn't fun to watch, though there was the golf course in the distance.
We had Tower 5 lakeview once. At that time, I don't think there were fireworks from Hollywood Studios, but I bet you could see those from that one, just not the Epcot or Magic Kingdom fireworks.