FP with OB is something you must be very careful with. Friends who were in the same field dropped the OB secondary to malpractice rates and reimbursements.
FP-short residency, easy to get into, nice schedule (except for the medicine months), many post-res options (fellowships, paths)
OB-Longer residency, easy to get into, NOT so nice schedule, better money
Good luck with the decision making process