Previous van was a Toyota HiAce medium wheelbase, single sliding side door and up and over rear door, the later is so useful if it's raining. Spare wheel under the rear bumper area so internal sides clear for ladders/racking, it was a second hand van when I brought it in around 2014, I think it was a '56 plate. But nice to drive and a high seating position so good visibility over cars beside you and low hedges on country lanes and near junctions etc.
Current van is a 114 Mercedes Vito 'compact' aka short wheelbase, issue initially being I didn't like it having sliding doors both sides (although I've got used to it now) but brought new I could specify an up and over door on the rear, a must have after three years of having one on the HiAce. I'd have a Vito again, but would almost certainly opt for a wheelbase that was long enough for the spare wheel to go under the rear bumper area. Seating position isn't as high as the HiAce and the door height seems low in comparison to the seating position so it's easy to bump your hear on the way in if you're parked by a kerb, especially if it's a little higher than average.
It's horses for courses though to be fair, same as with many things.
I know sparks who crave for a hightop van so they can stand up in it and/or one with a 3m internal load space for trunking/conduit etc. and also those who are perfectly happy with their VW CaddyMax or Transit Connect (aka the old Escort Van).
It all depends on what you carry day in day out and what you can put on the roof on the odd time you need to if conduit/trunking isn't your everyday job. But, saying that, there's always the delivery option from the wholesaler if you want to keep those mpg figures high.