Ghost is a far superior champion on offence but she does require a different play style which you need to learn.
However the comparison isn't even close - Champion is, by and large, a mediocre champion on offence but he can be a very strong presence on defence once he's awakened thanks to his unstoppable.
As an owner (and user) of both a 5* ghost, and a 6* Champion .. I have to agree with the others .. Ghost all the way .. way better than Champion . if if Champion is a bigger * . .;)
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However the comparison isn't even close - Champion is, by and large, a mediocre champion on offence but he can be a very strong presence on defence once he's awakened thanks to his unstoppable.