I don't know about the endurance race. I've been able to chop for pretty darn long with my FBM with out getting tired. (Then again, 8-9 years of swim team does help)

I'd probably just keep swinging both and won't really care when I get tired. Though the RES-C would probably absorb a good amount of shock and I would fell more comfortable in the hand for prolong chopping. Though I really can't complain with the FBM 'cause I could probably get through most the stuff in half the amount of chops most big knives need. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />