A lot of vanagon fans, myself included, don't really like the eurovan. Eurovans are more modern, more powerful, and more comfortable. (Or so I here. I've never been in one.) But they are too much like an ordinary minivan.
Probably the biggest complaint we have about them - and I think you can appreciate this - is that the engine in a eurovan is at the wrong end of the car. The vanagon is just more of a "pure" VW.
GoWesty has this write-up, well worth reading.
Model Choice: Are You a Vanagon or Eurovan Person?* - Library Article - GoWesty Camper Products - parts supplier for VW Vanagon, Eurovan, and Bus