I'm not sure the time difference between an NP and PA is all that significant. For someone with a BS (and it looks like OP is at UC Davis), there are accelerated NP programs where you can get a BSN and MSN in about 3 years. PA programs are generally 2 years.
CSULA offers a 15 month ABSN, and the MSN can be completed after that. CSULB used to offer their ELM (entry-level masters) program, but they do not have funding for it any longer. Many schools have similar programs if you search "accelerated BSN".
I would be more concerned about the differences in the job itself, scope of practice, billing, etc. than the length of schooling if I were debating between the two career paths. Nurses are able to get some pretty hefty scholarships nationally due to shortages in providers.