it seems to come down to either which scooter would actually be the best for the trip, or which scooter would look better in the film. To me they would be complete opposites. No doubt a modern big wheeled scooter would be better for the trip, but a vintage (or vintage copy, like the Stella) would make the film a lot more interesting.
2002 Vulcan 750, 2001 XT225
2008 Vino 125, 2009 Genuine Stella
2012 Zuma 125, 1980 Puch Newport moped