If Mourinho is available and hasn’t already committed to return to Chelsea, Moyes would be a mistake of Biblical proportions.
Manchester United is the biggest sports money pump on the planet. Today’s story about SAF is world news. The list of managers who can successfully step into that kind of pressure pit is very short and David Moyes, good as he is, is not on that list.
As an Everton fan, I know Moyes is one of the best in the business, he doesn't have nearly the budget to spend on players that United has, and yet he has Everton competitive year in and year out.