We ate at both - we had H&V for breakfast - and they had a great breakfast selection. It was a good meal and we had no complaints.
At MM we had the late lunch Fantasmic package - we thought the package was a good deal - for 1 TS credit we each got to pick an appetizer and an entree and we had a dessert sampler for the table. We had 3 apps - the clams, mozzarella, and a antipasto platter - all were very good. For the adults it was a mix of reviews on the entrees. I had the pork osso bucco - which was INCREDIBLE - the whole table agreed it was the best entree. The rest of the party had tuna, fish, and steak - all were average, but not great.
All in all both good meals - your choice whether you are looking for a buffet vs ability to order from the menu - I would look at the MM menu on-line and see if the food looks good to you.