I was going to say... Freightliner would make a lot more sense, especially as how Freightliner is a division of Daimler (also the parent of Mercedes-Benz) since 1981.
I love my small Mercedes diesel (2006 E320 CDI - just before the DEF nonsense started), and I would sure love to have a Mercedes in a bus.. until it comes time for service. Mercedes is renowned for being very pricy for service, but then again, most big diesels are as well.
Heck, I'm still eyeing the Sprinter vans