Amare is a good "best case" comparison...as athletic as Obi is he isn't what Amare was in his prime. Never seen a big man as explosive as Amare, he was incredible
https://www.youtube.com/watch?v=I-TtugILCWw
Don't get the Enes Kanter comparison since he's not really an athletic big.
Another NBA comparison I like is Aaron Gordon, but I think Obi is more skilled and just as athletic