✔ 最佳答案
Your question doesn't make sense. The better athlete is the better athlete, whether he's training boxing or MMA.
Boxers have traditionally been among the best-conditioned athletes, if that's what you mean. An MMAer trains much like a boxer, so their conditioning will be roughly equal. Boxing matches tend to last longer than MMA bouts, so a boxer might need more cardio on average, but there will not be a lot of difference.