Boxing is by far the tougher sport in terms of wear and tear. One just needs to look at the death rates for the sport, plus the general state of many fighters after they leave the ring. Perhaps only football comes close to the damage. Look up Bobby Chacon, Gerald McClellan, Jerry Quarrey, Meldrick Taylor, Leon Spinks, Joe Frazier, etc...., and watch the early interviews, then look at ones later in life. No comparison.