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http://media.comicvine.com/uploads/3/33451/1071959-shimmermammoth_2004_large.jpg

vs

http://media.comicvine.com/uploads/0/77/197135-150619-rage_large.jpg

I'd go with Rage; while Mammoth may have a higher baseline strength, Rage likely has the edge in the longer run. He's also a better fighter, as Mammoth is pretty straight-forward, with virtually no finesse whatsoever. Not sure who's more durable, ultimately, given the differences in their specific powersets, but Rage likely edges in terms of combat/relative movement speed.

I'd say Rage, roughly 6-7/10. I also reserve the right to amend that if I thumb through some back issues for better cross-comparisons...

Mammoth IMO.
Only have Rage appearances through The Initiative but I didn't really see him do anything impressive and if I recall right from Outsiders Mammoth was very strong and durable.