Scroggs is 100% correct. This issue came up several months ago in our FTO so subsequently I called around 20 European operators and asked the TMs if they would have any preference toward someone who had done MCC in a 737/A320. The answer in all but 1 case was that if anything, they would prefer an MCC done in a generic turboprop (Dash 8, ATR), as the handling skills for this type are somewhat more difficult than an A320. But the main point is that the MCC is not a type rating course, it is, to quote LASORs:
"The aim of this course is to train pilots in the functioning
of the flight crew as a team of co-operating members
led by the pilot-in-command on multi-pilot aircraft, and
its completion is required to endorse an initial multi-pilot
aircraft type on to a licence. This course may be
completed as part of the approved ATPL integrated
course, as a stand-alone course or as part of the initial
multi-pilot type rating training course."
Go with a provider who gives you high quality instruction and a cheaper simulator option.