Why a Type II Ambo? Parking constraints? If you want space and flexibility, then no questions, the short bus is going to be the better choice, you'd pretty much have to gut a Type II to be able to haul bikes in it..
However, If you're idea of a shortbus is anything but a 12~15 Pax E350 with no body modifications, then a comparable Ambo is a Type III or Minimod, Not a Type II, and if you are looking for 4wd anyway, your quickest and cheapest route is actually the much ignored Type I ambo.... but I'm biased...