Interesting question. I’d say it depends on your use. The Mercedes has greater load & towing capacity. Also the 24’ Gemini/Compass has a longer wheelbase & overall length. The engine is probably a wash. I only have experience with the Ford diesel and it’s a fantastic engine. We use our 23TR like a second car locally. Perfect size for tailgating at grandkids sporting events. No issues parking on trips. If you want to have a towed vehicle the Mercedes is probably a better choice. If versatility is a priority then the Ford Transit would be the better choice.
Hugh
https://www.thormotorcoach.com/compass/specs/
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