All of the points that have been mentioned are fairly accurate and I share the sentiment.
I'd just add that the comment regarding more opportunity for competitive specialties via the osteopathic route has its pros and cons.
Getting an ortho spot may be easy just going off the numbers, though it's still competitive, but you're limited to living in OH or MI, or a few other places. Additionally, specialties like orth essentially REQUIRE you to rotate & do audition rotations, and the spots are always sealed before match day even comes out. This kind of behind-closed-doors crap doesn't go on in the NRMP.
Specialties like rads and derm, however, are scarce, and though you may land a DO derm or rads spot with high COMLEX scores, your training won't necessarily be the equivalent of a big University based allo program, and some specialties simply NEED big volume University based experience (pathology being a perfect example).
I remember rotating at SunCoast Hospital in FL as a 3rd year. They had residency spots for gen surg, gas, IM, FP, and some others, but the place was pathetic. Just an example that you may have the opportunity to get a gen surg residency slot, but it may not offer the best training.
I like to tout the example of the guy who graduated top of my class & got a rad spot at a very good University based midwest program...first DO they ever accepted...the caveat being he was, of course, top of the class, and smoked the hell out of the USMLE (and COMLEX...like that mattered).
So I think the question comes down to what specialty you're actually going for, though you generally don't have this forsight as a pre-med applicant, and this also depends on the types of physicians that run the program you're applying to. Maybe the rads program at Ohio State is very DO friendly if you're a good enough applicant, but the program at U Wisc is anti DO. How bent are you on getting a good University based rads spot vs some community based osteopathic spot?
Allo programs are not hands down better than osteo programs, but for some specialties I think this is generally true.
You need to ask yourself, what kind of program are you looking for? If you're satisfied scraping the bottom of the barrel just to get in a specialty, at the expense of risking your education, you should rethink your plan. Not everyone can get a derm, rads, ENT, gas, etc, spot, and you shouldn't simply look at DO school as an easier way to get in a high demand specialty.
As a DO, it doesn't hurt to apply for both or just ACGME IF you're a strong candidate & are confident you'll get an ACGME spot.
Or, in cases such as psychiatry, or pathology (where there aren't any DO residencies), your decision has been made for you.