If you will be carrying shoes and/or clothes and a book, the MA is definitely the way to go!
In my MAM I carry the ordinary stuff like wallet, makeup bag, water bottle, planner, keys, phone, ipod, digi cam, a pouch full of toiletry type things, and a paperback book and snacks.
When I know Im going to be carrying all that and need more space for something like an extra water bottle, another book, or a pair of heels, I grab my MA
In my MAM I carry the ordinary stuff like wallet, makeup bag, water bottle, planner, keys, phone, ipod, digi cam, a pouch full of toiletry type things, and a paperback book and snacks.
When I know Im going to be carrying all that and need more space for something like an extra water bottle, another book, or a pair of heels, I grab my MA