...and only you can best know what you are looking for in a timepiece. IMO the GO is more elegant and uncommon -- you are probably less likely to run into your office mate wearing one on his wrist. The Rolex is a tried-and-true performer with world-class brand recognition. I think both watches easily make the transition from casual Fridays to the boardroom, but perhaps this GO is at the dressier end of the sports watch segment. Of course, I've seen many a Sea Dweller on the wrist of elegantly suited gentlemen, and found it to be perfectly at home there. If you are the sporty sort, and expect to spend a lot of rugged outdoor time with this watch, I might go with the Sea Dweller. I'd be more likely to take it for hikes and jetskiing. Not that the GO wouldn't be up for those activities, but it seems too pretty for an intense day at the lake IMO!
Sorry, this post is not that helpful, is it? I think I like both watches too much to put forth a favorite between the two.
Good luck with the choice! I'd be proud to wear either of them!
Daos