Muscle Zodiac Effects

[Mayabird]

Not for a while but eventually when Mayabird ascends again, I'm going muscle sign (though keeping the accordian thievery - do you realize I only recently learned that I can buy stuff at other clan's shops?). The only problem is, I'm not sure what any of the muscle signs actually do. I can find things related to what the moxie and mysticality signs do, but why would I want to pick Wallaby instead of Mongoose, for instance? Does anybody know what they do or have suggestions which one I should pick?