I have the choice of dissecting a frog or a crayfish?

We just dissected worms today and with my 2 partners Karen and Courtney and Karen did the slicing i did some too and courtney just watched(too grossed out) It was cool but we dissect frogs and crayfish later on and me and courney are each going to dissect one or the other. I think i wanna do the frog but it might be to "bloody" for me but crayfish freak m e out. i can't diside wich one i should do? help? which is better?