My Speedies and my GMT compete most often for wrist time. I'm in the heavy construction business and utilize the chrono function a lot, so the nod goes to the Omega. The GMT-C has tremendous presence without being oversized. 
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TT OysterQuartz, SS/Black "U" Daytona, TT GMT II-C, DD OysterQuartz, Breitling Aerospace, Omega Speedmaster Pro
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