There isn't one except that the big stack can sometimes be a very good player (i.e., he accumulated the chips rather than buying in with them). It is better to have position on a good player than for him to have position on you.

The only time stacks matter to me in limit is when they are very small. These guys will often put themselves all in without the best of it attempting to freeroll on you. You can easily turn that around on them.