So much depends on your travel style and what sort of comforts you will be happy with. I have a 72 year old friend who spends a few months' worth of nights each year sleeping in the back of his Toyota Tercel Wagon from the '80s, most often in wintertime near ski areas or backcountry ski tours (in case you've ever seen the documentary "Dirtbag" about climbing legend Fred Beckey, it's worth mentioning that this friend of mine has climbed with Fred more than once and is in Fred's direction in terms of expenses and creature comforts or lack thereof 🙂 ). We have done a lot of camping in our Class B van - a standard length Ford E250 with things like furnace, fridge, inverter and microwave, but no bathroom. We've been pretty happy with it but as I've eased out of salaried life it has started to feel a bit small for the two of us on extended trips, particularly when the weather turns wet and we spend more time inside the van. I think it will continue to be my go-to choice when I do solo photography safaris to places like Utah for a few weeks, but we've decided to get an Ollie for many of the trips my wife and I will take together.
As a former colleague put it, "each tool is best for something and worst for something else." The van is very maneuverable (including the ability to be parallel parked in any decent length city parking space), we can leave the dog in it with the vent fan running on most days while parked for errands etc., and it's nice to be able to transition from driving to hanging in the living space w/o needing to get out of the vehicle. But it can feel quite small at times, it is at times a bit of an annoyance to shift from sleeping to driving modes when we will be returning to the same site that evening - to the point where we sometimes defer errands or driving outings in favor of on foot or on bike explorations nearer to camp. We have strategies for dealing with the lack of a bathroom when boondocking or staying at park campgrounds that have no showers (including a "sun shower" unit etc.) that work OK enough in many situations particularly in warmer more pleasant weather. But I am looking forward to being able to use the Ollie wet bath, to have a "home base" that one or both of us can drive away from (we don't always want to leave camp at the same time!) and to just have a bit more space for some of our outings. For now I expect to keep the old camper van as it has more utility value to me than it has resale value given its age and mileage ( it still running and working quite well).