Regarding MCC, cheapest is best, for the reasons already so ably menitoned by benhurr and mad_jock.
IF however, you want to get into an airline via CTC then you have to do their AQC course, which includes MCC. This was introduced as a clever way to get new pilots to pay CTC for their MCC course (plus more for what is virtually the old LOFT course), instead of CTC just running a sim assessment, which they used to do. It also serves them better because they get to see you over a number of days rather than just 2 hrs. The crux of the matter is that you pay for all this sim time and instruction. If you don't come up to scratch, then you walk away with an MCC certificate and several more hours than the non CTC pilot in a sim (not that that means anything to an airline).
You pays yer money and makes yer choice.
PP