Oh that is very difficult. There´s just two things to consider, registration/tax vs. mobility and no tax/registration and just as a scooter.
If i felt like paying tax and register as motorcycle: Dultron II or Nami-BurnE (favourite). That should really cover it, although a proper e-Bike might be better offroads than either of those scooters, but that would be it.
If inside city limits, Emove Touring without any tax (if i can sneak in the Cruiser, that would be even better).