If you do a search on here for the Abbyshot and Southbeach jackets I think you'll find that they've been discussed before.
I know of at least one person who was able to get Abbyshot to sell him the plastic shouldercaps they make so that he could upgrade his Southbeach jacket. I personally cut some custom plastic shoulder caps out of a baseball helmet.
The Abbyshot jacket is a much higher quality leather and a higher quality jacket all around. It's also lined inside for the cold. Good if you come from a cold weather place, bad if you live in the heat. The Abbyshot jacket is one you might consider wearing on a motorcycle for safety, the SB is not.
The upside to the SB jacket is that it has a tapered cut to it - The Abbyshot flares out incorrectly, which is good if you have a gut, but if you've got big shoulders and a small waist it will make you look fat (and more importantly, the cut just isn't screen accurate). And the SB is cut a bit higher, showing just a hint of the belt, like Max's does (the Abbyshot is incorrect in that it usually hangs a bit too low).
Neither jacket is perfect.
For the pants, if you want screen accuracy, make sure you specify to SB that you want NO POCKETS AT ALL. The pants Max wore in MM2 had front pockets, but no back pockets. The MM1 pants he wore had no pockets whatsoever.