Many on SDN feel like the MMS degrees are looked at more favorably by adcoms and are usually only 1 year.
I'd have to disagree with this. Although if you are doing a masters in medical sciences to prove that you can handle med school courses, then yes, however if academic performance isn't an issue, then a traditional thesis-based masters in science is actually better than any MMS degree due to the research aspect. Clearly a 1 year MMS program does not mimic the rigors of a thesis-based program. You could do some extra research on the side, but its tends to be limited compared to a masters thesis.
Therefore it depends on what the goal is. An MMS does not guarantee admissions, nor does an MS in some science. If an MMS was so pleasing, then I would be very content that my PhD in pathology would get me into med school. I'm sorry to say that is most like not the case. Ultimately, you are expected to do well in whatever you do. Eitherway the OP will learn some medical science between now and the future. However to "tailor" your application so that it is more "pleasing" to adcoms is quite ludicrous given so many variables involved with the admissions process.
Generally a masters is pretty worthless if you are continuing to get a doctorate of some kind.
Although I am also perplexed that there is such a thing as an MA program in Genetics, I can't agree with this statement. "Generally" a masters does involve research over a 2 year period. For those that want to get a doctorate, it serves to give them some research training, and additional specialization in a select topic which they plan on using in the future. I would say that half of our med school faculty have at least a masters in addition to their MD. Most if not all of these faculty members use their masters for their research. Obviously the MPH degree is quite numerous, but we have faculty who have a masters in statistics, biomedical engineering, biochemistry, and so on. This highlights the fact that it DEPENDS on what you wan tto do, rather than a masters being generally worthless due to earning a doctorate degree.
Based on this assessment, one might as well call my PhD worthless since the core curriculum consists of the 2nd year med school courses, and some of the 1st year courses as well. Obviously this is false, since within the scope of a normal MD program, I wouldn't have been able to complete a PhD-level thesis project. Therefore the take home message is it really depends on what the OP wants to do. IMO, to assume that "Action A" is pleasing to the variety of adcoms (e.g., humans) is just a tad naive. Just think about it, if an MMS is so pleasing, people would be flocking to such programs by the truckload. Yet, most applicants apply with just a BA/BS degree.