I have 2 MOAB's that I love. I can't say enough about them, awesome bow. If you search MOAB on here, you'll find a lot of threads talking about them.
My 16 yr old son shoots a 49# Mag, and its a sweet shooting bow. Fast shooting, quiet and easy to shoot. For myself, I prefer a little longer, but he loves it and shoots it well. Both are great shooting bows. I will say that the Mag is a great treestand bow, with its shorter length. For a shorter bow, it preforms as well as the longer models. If you can get a chance to shoot them both, I guess that would be the deciding factor.