Which is cheaper in Europe - traveling by converted van or airbnb hopping? [closed]

My partner and I are planning to travel Europe for a year, spending 2 - 4 weeks in every destination and exploring as much as we can. We'll be working remotely, so we want to keep everything as cheap and convenient as possible. If you've ever travelled in a converted van, or spent a long time Airbnb & hostel hopping, I'd really love some opinions on which might be cheaper. Have been looking around, but comparisons and proper advice are surprisingly hard to come by.

If we do go with airbnbing, we'll catch cheap flights with just our backpacks and do a lot of hitchhiking. And with the van, we'd put about a month of work into it, and keep it as low-budget as possible.