For our purposes, and having driven both a Sprinter and standard cargo vans, a Sprinter is a really large and sometimes incredibly expensive cargo van.
A Sprinter can be had with a 14 foot long cargo section, and with the Super High Top you can easily stand up in it. The standard cargo van-- I've had both Fords and now this Chevy-- has a 10 foot cargo section and the roof is just over 50" from the floor, with a 48" door height.
The Sprinter, regardless of the nameplate they hang on it, has Mercedes power. Expect to spend money accordingly. The diesel fuel economy is better, the newer ones not as much better though.
Fords and Chevys are cheaper to begin with and cheaper to get fixed when they break than Sprinters are, the gasoline engines burn more fuel and therefore your fuel cost per mile is higher. I haven't driven a diesel standard cargo van, so I don't know how they compare-- except to say that up to now, Fords and Chevies have used American engines so repairs should be easier to get, if not cheaper than Sprinters. Ford is getting ready to bring in the Transport vans that they've had in Europe almost since the invention of dust, so we'll have to see how those compare against Sprinters.