My knowledge of both programs comprise almost purely off of reading input on SDN from the past couple years and off of their websites so you can take my opinion with a grain of salt as I have no personal experience/investment in either.
I read this post and it made me scratch my head a bit.
http://forums.studentdoctor.net/showpost.php?p=9921117&postcount=7
I don't really want to keep vocalizing my dislike for Drexel's method of creating what I have always seen as "low efficacy programs" for the sake of stealing money but if what this person says is true, then Drexel has essentially created a 3 tier system of dubious programs. I gather from many past posts from former IMS students that the acceptance rate of IMS students is about 10% of the class, give or take a couple % either way.
This all would mean IHS is a filter program to send you into their MSP program who
then filters students for IMS who
then only accepts 10% back into DU-COM. Hmm..
You can also look at it from a different perspective, disregarding what all the SDN members who have posted negative things about the IHS program. Drexel has argubaly 5 "medically oriented" programs (they're purpose is to send you into medical or dental school): IMS, MSP, IHS and DPMS. On SDN it is commonly accepted that MSP is used as a stepping stone into IMS if students do not get into IMS the first time around but it does not state this on Drexel's website
http://drexel.edu/catalog/certificates/msp.htm
so let's just run with that for a moment that all of these programs are geared to enhance your application for medical school. I have no idea how large Drexel's medical school class is but let's just throw out a figure like 160 or something. With 5 programs, DPMS has about 25-30 students if my memory serves me correct where every single student is given a conditional acceptance to the medical school when accepted into the program. Technically that's 25-30 spots already reserved out of that 160. Then IMS sends about 15% (let's be positive) of their class into DU-COM which can be anywhere from 12 (class of 80) or 15 (class of 100). That's already 37-45 spots taken in a class of 160.
That is already 28% of the incoming class disregarding the other 2 programs. I have high doubts on an allopathic school accepting more than 28% of students through this type of backroute as opposed to "traditional" students. Again, I could be wrong but common sense and looking at schools like Gtown, Tufts, and other such SMPs and their acceptance rate back into their medical school from their own programs doesn't even come close to 28%. I figure schools like EVMS can afford to have a high linkage since they only accept 22 students making it easy to accept back most of them.
What was the purpose of all of that hypothetical thinking? I just reason that IHS is simply a filter program (like the initial link that I pasted of the former Drexel student) so you're looking at probably 2+ years before medical school at the very least (realistically) if you wanted to get into DU-COM.
MC on the other hand is a little known program imo but on their website they seem to be very open on disclosing which students have gotten into medical school and where. Granted the majority of the MC graduates seem to precipitate to either ole Miss or DO schools in the region, they still boast a very high acceptance rate. Also the few posts that have been in this forum of MC have been positive and as sshateme pointed out, it is cheaper.