Since UMDNJ (University of Medicine and Dentistry of New Jersey) has 3 medical schools, 2 allopathic and 1 osteopathic, a dentistry school, graduate school, nursing school, and a PA school, I highly doubt PCOM is more widely known as a name. Of course I could be wrong but that is the reason for my opinion. I dont think that matters all that much but I wanted to point it out anyway.
We have a small class size and yes more of us do go into primary care historically but many do enter highly selective residency/ fellowship programs, this is just an individual accomplishment/ preference not a school or class preference. If you want it bad enough you will get it, the tools are here. The residency programs at both schools are for the most part top notch and so are the hospitals from what I know. Being at either school will give you a leg up on the competition for getting into those residencies so those are things to consider.
PCOM is a great school so I would take my time in choosing (I actually did) but make sure you choose for the right reasons for you. I chose UMDNJ so of course my reasons led me there and others chose PCOM and so their reasons led them there. Good luck and congratulations for having to choose from what I think are two of the best medical schools in the country.