I like the gmt, but never had the chance to try the 58... i think it really comes to the moment where i will see both and be able to try.. i like slimmer watches and do not really get the trend of bulky watches. What is going to be difficult is the gmt complication, which i like a lot and the 58 does not have. All in all, i think it is going to be the 58, purely because of the design and size.
Enjoy yours and thanks for the feedback