Won’t make the slightest bit of difference what you did it in with regards would it help get a job.
What I would say is if it’s not much more in cost, to do it in the 737, then do so and enjoy yourself.
The MCC is just a tick in the box. Have fun and remember that the MCC course is all about CRM.
It’s about learning how to be a great partner in a 2 man crew environment and good teamwork.
Enjoy