This is a good starting point - generally, programs with strong OB will also have strong training in other non bread & butter outpatient primary care areas as well
As you look at the curricula for these programs, you'll get a sense of what's a lot or a little of inpatient medicine blocks, peds, etc. and can compare to other programs that may not be on this list just because the guy who makes the list doesn't know or doesn't know much about them.