Scooter Review have now published this practical review of 13 different 50cc scooters online.

scooterreview.com

Models reviewed: (not all models were available to the reviewers)
Yamaha Jog
Vespa 50S
Vmoto Milan
Keeway Venus
Suzuki AZ50
Vespa LX 50
Honda Today
Adly Silver Fox
Yamaha Vino
Lifan Metro
Urban R4
PGO PMX 14.3
Piaggio Zip