I appreciate you not wanting to comment until you have some data to back it up, but at the same time, I'd appreciate hearing your comparison of the two texts. I've briefly glanced through both of them, but I haven's started formal studying for step 2 yet so its hard for me to really compare them at this point. It would be really helpful to hear from someone who has done some intensive studying with both of them.
Ok since you are facing the same dilemma, I'll try to go ahead and do my best on this. Fact is, I'm still preparing these days, so my opinion continually changes on these books and quite frankly is meaningless unless I do well. And my only experience with mcq's is some Uworld practice- I have not taken the step 2 yet. And my final disclaimer is that Im a US IMG - went abroad for med school. Thus I'm not in the same position as all the AMG's on this site who just do 2 weeks of Uworld and get 250+ on this test...
Alright, I read through MTB initially and then did about 1000 Uworld questions at the start of my prep for a couple of weeks. Since it didn't help, I switched over and took the DIT step 2 course because I felt I needed help. People claim MTB has "everything" in it u need to know. The facts might be squeezed in there, but it doesn't really help you by itself.
For example to take something simple, MTB will mention "heat stroke", expect you to know how the pt. will present and then for treatment says "IV fluids, evaporation".... Ok so its there right.
Now for a person like me, I don't really know what is supposed to be the best way to cool a person down when every book lists "IV fluids, cooling blankets, Ice packs, Evaporation, blah blah"
But in the DIT lecture, the guy says "Let me EMPHASIZE, Evaporation cooling is the best method to cool a patient down". Later that day on Uworld that exact question showed up and I remembered that line. So thats a simple example
MTB also tries to oversimplify everything too. Sort of like ABC everything. But in doing that, Kaplan dumbs it down too much. I mean they say
Subacute Combined Degeneration of the Spinal Cord - from B12 deficiency OR syphilis; You lose position and vibratory sensation ONLY (dorsal column)
While Step up to step 2 says u lose dorsal column function in tertiary syphilis but dorsal column AND corticospinal tract in B12 deficiency (which is actually more accurate).
For the people who took the Kaplan course and already know everything (concept wise) and now want a quick run through for memory sake, it might work. But I went with taking the DIT course
I have to warn you, however, that in DIT, he adds A LOT to step up 2 and corrects A LOT of things too so i can't wholeheartedly recommend step up 2 either, even though its a decent book.