I now own a MA in addition to my Matinee (my SA from Nordstroms called me when one became available). I'm still using my Matinee bag but I really love the MA. The leather is so soft and thin and the bag extremely lightweight. The main opening is much larger making it easier than the Matinee to get in & out of. I do find the MA a little boxier compared to the Matinee which makes it almost impossible to carry it on your shoulder (I also think the Matinee's drop might be just a tad longer). At least I wouldn't be comfortable with the MA on my shoulder. I wouldn't carry the Matinee on my shoulder either, but if I needed my hands free, I know it would be possible.
Now that I own both, I'm very happy and I wouldn't trade either one, but if I were forced to choose between them, I still think I'd go with the Matinee if only for its many pockets. I also think that overall it's just an easier bag to carry. It's a close call, however, because I really do like the MA a lot. As for its size, I think the Matinee is a little smaller than the MA. It's a little longer but definitely shorter. The MA has a more boxier or dome shape to it.
Both bags are equally great, though, and I think it just comes down to personal preference. If you like to carry larger bags & always carry them on your arm, the MA might be the one you really want, but if you want a good size bag w/o it looking too large and the ease of putting on your shoulder if needed, the Matinee might be your choice.
I don't think you can go wrong with either one, however.