If that is the only consideration then yes, especially given EMH (all resort hotel guests get every MM, so my recent experience has been that MM is more crowded than it used to be).
That said, we recently were faced with this same decision and ultimately we were more comfortable buying tickets with MM, as they seem to be (and apparently are) tickets emailed directly from Disney and are identical in every way, near as I can tell, to tickets purchased on the Disney web site.
(Last year we bought tickets from Disney, via email, and this year we bought from way.com, and got what appears to be the exact same stuff, including receipts and whatnot. Haven't used the tickets yet.)
Also the X factor in our situation is that we are likely going to try to add a sixth day, and again, I didn't want to make the situation weirder than it will already be... also we might have lost any savings when attempting that upgrade, anyway.
So for us, group of six, it was worth the extra $100ish, considering that we are hoping to add day six for $90 total, and figured it was likely if we didn't pay the $100ish extra now, we'd get hit for it later and/or be told the non MM tickets were not upgradeable.