On video, the GMT does look chunky on your wrist, OP 34mm looks perfectly good. But like you have said, the effect may be different in real life vision.
Both fit fine, it's personal choice but I prefer the look of the OP on you. The GMT looks flashy which definitely has it's place as well, just not for me
My opinion the OP suits your wrist better. The GMT is fine but blue face is better proportioned for your wrist.
On video, the GMT does look chunky on your wrist, OP 34mm looks perfectly good. But like you have said, the effect may be different in real life vision.
Both fit fine, it's personal choice but I prefer the look of the OP on you. The GMT looks flashy which definitely has it's place as well, just not for me