If it’s a factory AT rifle, there is no reason to use anything other than an AW mag. Word on the street is MDT is working on a high(er) capacity version, but haven’t given any details on if/when they would be available.
+1 on AI mags. All I ever used when I had mine. The MDT I'm sure will be nice but $ AND I would want to see some real world use for reliability, fit etc.