I think this is pretty one-sided and in Drogo’s favour.
Daemon was good at swinging a sword because be was idle rich and thus had all the time in the world and instructors to instruct him. The Targaryens being a martial family, it was expected of him, but he was also brought up in a time of peace. The Dance was a bloody affair, but short and most fought on dragon back for Daemon.
By contrast, Drogo has never known a life of peace. His culture and station demand he earn his place with blood. The way Drogo is described, I think he’s both too strong and too quick for Daemon, and not only that, he fights to kill as though it were breathing. He can fight short range and long range, mounted or on foot, armed or barehanded.
Drogo is a genuine killer because that’s his way of life, and combined with his physical attributes, versus Daemon’s overall lacking, I’d say he wins this every time.
Daemon could always pull of something clever but it’s not like Drogo is a fool or lacking for wits of his own.