Having been a long time full time RVer…neither is really adequate for longer term use IMO, but the van is less inadequate than the slide in from our looking at them in a post 5th wheel life. Anything more than a couple weeks in either for 2 people wouldn’t really be optimum…but it depends on the couple I guess.I keep seeing this statement and shaking my head. My partner and I love traveling our 144 Sprinter. Plenty of room to edit together at the table, or if feeling lazy, in the queen sized bed. To imply that a slide in camper is more efficient for two people is silly. Biased yes, but I researched ( and used) both approaches in depth before choosing.