I also have both the B22 and the D2. Both great enlargers, and the negative stages can be aligned, unlike (at least some time ago) the Beselers.
To your question, the quality of the light path, optics, and etc. are the same for both, if the lens is the same. If you don't need a larger format, I would use the B22. Beautiful machine, and a cold light head would be cheaper, if you decided to get one.