Boilerhouse, Agree, hard maple is a different story. We don't have that around here, but I have worked with it in the wood shop. I think that is what they make bowling alley lanes out of, so if it can take that abuse, you know its hard and would make good firewood.
The only good I remember about silver maple was a kid the neighbor had a huge one in their yard and the helicopter seeds were fun to play with! But my parents hated that tree because it broadcast those little helicopters everywhere.