MTG-910 all the way. One of the best looking and most comfortable to wear watches, Casio ever made. The mudman doesn't even come remotely close and its look is - well, let me put it nicely - very "special". Function wise both watches ain't great. The mudman buttons are way too stiff to make them comfortable for daily use and the MTG's buttons are too recessed and small, so you need often your fingernails. A big minus on the MTG is also the lack of a countdown timer.
So if you are on the hunt for wearing comfort and a great looking watch, go with the MTG. If you are looking for maximum functionality, neither one is the best choice.
Two rather strikingly different looks with those two watches. I wouldn't worry about wear when talking about a G-Shock. From what I've read, most are pretty comfortable on the wrist, with a few exceptions. Consider more about how you're intending to wear it. If mostly casual and knocking around on the weekends doing activities, go with the GW-9010 Mudman. If going more for business casual, take the MTG-910.
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