Max's dress sense is almost identical to that of his Prime counterpart, albeit with the addition of a fishing jacket.
Max cares about his grand kids, and is usually not too strict with them. He teaches them things a normal parent would teach. He is usually on Gwen's side when Ben and Gwen fight. He also seems to get confused easily when meeting more than just his usual version of Ben.
All of the events of the Ben 10 Reboot up to but not including Omni-Tricked occurred in this dimension and therefore to this Max.
Max tried to help Ben and Ben 10'000 escape from Time Breaker Tetrax in the Rustbucket. However they soon learned that this wouldn't help due to Tetrax's ability to freeze time whenever the Bens are out of eyeshot.
Max later helped drive Ben Prime back to Bellwood.