P51 Mustang with pedals
I work on a lot of different bikes and my personal favorites all around are the Puchs and Piaggio Vespa mopeds.
I recently bought a Manet Korado and it combines the best features of both Puch and Piaggio. It has a Puch engine and a Piaggio single tubular steel frame (like a Grande only a single tube).
My personal ride is a Honda Urban Express, it is technically a "Noped" but is a 50 cc engine and tops out around 30-35. The Honda quality and engineeering really shows through. It is super easy to work on and it is a stellar hill climber.
I would love to find a Zundapp but so far no luck.