This may be a dumb question, or it may not: Do M/B and Freightliner dealers repair Dodge Sprinters? If I do get a Sprinter I don't want to have to depend on Dodge dealers to do repairs; from what I've read they aren't very good at it.
A Sprinter is a Sprinter is a Sprinter. Other than a few cosmetic difference like the grills and the name on he back door, wheels, steering wheel, and front cover of the Owner's Manual, they are identical. So if they work on Sprinters at all, which brand of Sprinter is irrelevant.
I had my Freightliner Sprinter for more than 4 years before it was first worked on at a Freightliner dealer. My primary Sprinter mechanic is at Parkway Chrysler in Benton, KY. They are excellent, and it's a small town so they know if they screw you over everyone in town hears about it. Many big dealers in big towns could care less.
Some Dodge dealers are very, very good at it, some are not. The same thing goes for Freightliner dealers. I wouldn't take my Sprinter to Dallas Dodge again if it meant having to walk home. Nor would I take it back to the Freightliner dealer in Harrisburg, PA again. Dallas Dodge tried to screw me with pricing, but at least the work they did was satisfactory, but the Harrisburg Freightliner charged me for work not done and still stuck to their guns when we proved they didn't do the work.
I've had one other Freightliner experience, and it wasn't one that I'd go back to, either. I've had far more good experiences at Dodge dealers. It all depends on the Sprinter technician(s) and how well trained they are.
There are a lot of general maintenance and repairs on a Sprinter that aren't Sprinter-specific, meaning you don't have to be a Sprinter tech to do it. Things like brakes, alternators, water pumps, belt tensioners, etc., so other than parts availability being a problem at some locations, any good mechanic can work on them. Parts can be easily ordered online, and some can be ordered at Autozone.
Dodge dealers may or may not be able to work on 2011 and later Sprinters, because they are no longer dealers for those model years. Most Freightliner Sprinter dealers that were Sprinter dealers before the MY2011, still are, and will work on them. Freightliner dealers who are not also Sprinter dealers will probably not work on them, tho a few will depending on what the repair might be.
The MB Sprinter dealers did not sell Sprinters before 2011, and couldn't even get parts through normal channels for earlier years, but they can work on them now. Many non-Sprinter MB dealers can and will work on Sprinters, since there are many similarities with other MB vehicles.
There's a Dodge dealer in Dubuque, IA that is not a Sprinter dealer, and never was, yet they have an excellent Sprinter tech there.