Gatch One. Cap has way more experience, and would be more likely to prevail in some sort of tactical scenario. In any sort of straight fight however, Ryu has him overmatched. The Science Ninjas are far beyond human in terms of strength, speed, durability, senses, agility, and reflexes. I doubt niether one would be able to tag the other with their thrown weapons, in close however Gatchaman One owns.