I too vote for MG. Been on there twice. Celebration once (with another cruise booked for September) and going on Jubilee in February. My family loves the Excel Ships. As others have mentioned, so many more included food choices. Lots to do and so many different places to just hang out.
Most things take place on Decks 16 and 17 (Lido) and then Decks 6,7 and 8. Nice to get a deck in the middle of those. Easy to get to everything. Sure there are more people, but they have everything spread out nicely. Did not notice increase in crowds.