There are several reasons I would choose ABFM over AOBFP. First, the AOBFP is essentially an arm of the AOA. Should you have a social/political organization controlling a specialty certifying board? They should remain totally separate. If you become AOBFP certified, you must remain an AOA member in good standing to "maintain" your certification. Currently, this is $683/year (not including your certification maintenance fee). Over a 30 year career, this is over $20,000 (if the membership fee does not increase -- but it has a history of frequently being increased). Secondly, the AOA/AOBFP have genuinely messed up their "continuing certification" (OCC) process. It has become crazy. Just one example -- the AOA's CME cycle is 3 years long, but the recertification and OCC cycle is 10 years. The OCC requirements are onerous at best. To some extent this is due to the AOA trying to standardize all of it's specialty boards to the same OCC rules. Maybe the ABFM has it's issues as well, but the ABMS seems to be attempting to adress the issues, and each board is in charge of it's own process, so that it is more relavent to the practice of that particular specialty. Thirdly, the AOBFP (and most AOA certifying boards) just as the AOA, is the worst "good old boys" club in medicine. It is difficult for new ideas and leadership to get past the old guard.