Join Date:Joined: Nov 2013
I have both phones, both on stock ROM. The S3 is getting more and more laggy.
Pro S3: Slimmer, less weight, slightly bigger screen, better camera
Pro MG: Blazing fast, feels more sturdy, Kitkat in '14, no balderdash, great battery life
If it wasn't for NFC & removable SD support I'd ditch my S3 right away.