which is harder wear and tear-11b or 19d?

I am 36 years old and looking to join a combat arms mos. Which of these two jobs causes more wear and tear physically on a soldier? I know this is the infantry forum, so I expect guys to say 19d because 11b is the most hardcore, but I would like an honest assessment. Correct me if I am wrong, but it is the large amount of marching that tears down an infantry soldier, right? If so, does 19d march as much? One would think not, but I am uninformed, so please help. Thanks.
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