After 3 years of flying for a UK airline, i can tell you that the type and quality of sim are quite immaterial. Get the best course you can get, with the best instructors and the rest will follow.
It is not a "this is what its like flying for an airline" course, more this is how to work within one. Sorry if this sounds condesending but all this talk about full motion etc is nonesense. You could do a MCC in a car.