ron.dittmer is the guru on phoenix and has a 2007 PC 2350. he has often posted detailed breakdowns of B+ vs C features. i like our B+ also.
forget about wiring or unique maintenance needs of a chevy or ford B+. as ron will point out, they are Cs that are typically 6-8" narrower than a C, and usually have streamlined fiberglass front and rear outsides.
the fiberglass roof of the winnie 22R and PC 2350 is a good thing for a motorhome that sits outdoors a lot. the narrower PC will be a little bi easier to drive, but out west where things are more spacious, the difference may be nill.
i think you are .ooking at equally good choices. research if newer winnies have leaky cabover bed issues (they may not). if they do not leak, like you, i'd go w/ winnie for newness and a bit roomier interior.