It's all relative. Middleweight motos are about the bulk of maxi scooters. Motos often lean, brake, and handle rough pavement differently from scooters. Most scooters tend to have smaller wheels/brakes/bars/travel. The rake, trail, and weight bias could also be considerably different for most.
I know that my 650 thumper dualsport is a lot more flickable than my 600 I4 UJM and their weights aren't hugely different. The rake, trail, bars, and weight bias are very different though.