There is a HUGE difference. Sprinter vs Promaster. Diesel vs gas. Rear wheel drive vs front wheel drive.
I chose the front wheel drive, gas Promaster because I love the way the front wheel drive handles and strongly prefer gas over diesel.
Add the big fridge and price difference... and it is a no brainer. LOL
But it is definitely a matter of taste.
2021 Promaster 1500 118wb conversion
2019 Roadtrek Simplicity SRT (almost a Zion)
2015 Roadtrek 170
2011 LTV Libero
2004 GWV Classic Supreme