Exactly, you have to look at other factors. If we're in the AL, then Player A is a no brainer for your DH. Unfortunately when you factor in the position Player B may be an elite CFer and in which case, you would take the slight drop in SLG or OBP for his exceptional defense, while the subpar defense of Player A to the point where he HAS to play DH drops A down a bit. It's all relative to the actual player. I'm guilty of using this same analogy a lot when discussing with friends but without various other factors it doesn't really hold up.