I believe it is Teen Gohan, for he is a sayain and also he has gone through much training with people stronger than Krillin like Piccolo and Goku.
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At the start of Dragon Ball Z Krillin was stronger but on Planet Namek Gohan became stronger.
depends are you talking about normal because if you are they are the same but krillin with unlocked potentiol vs. angry gohan: gohan would win every tme, but let me ask you this how many times has gohan died compared to krillin
which adult gohan are you talk about around great saiyanman saga? teen gohan stronger than adult gohan about twice but if you talk about adult gohan (mystic) adult gohan will kick teen gohan butt very easy
Goku (End, Mid and Early), Krillin, Gohan (Kid, Teen,Ultimate, Adult and Future) and so on...
Mystic Gohan (big) is a bit better than Super Saiyan 2 (teen) Gohan.