Intresting site you have suggested.
For those who do not know, VW buses (Westfalia, Euro Van) are the ORIGINAL Sportsmobile.
They are the gradfathers of every SMB today.
For some people the VW bus is just the right size.
For others it is too small, hence the Sprinter, Ford or GMC platforms.
Sprinter vans are big and best for road use.
They also do much better on fuel usage.
Obviously this is a personal choice, so to compare or say one is "superior" or whatever does not really apply.
When a camper van meets your needs, it is lots of fun and the owner is happy.
If you see needed improvements, do it or get a skilled person to make your ride even better.