What's more important (to keep at "natural" levels)?

An answer in another thread kinda surprised me. Let's say your land couldcarry (640 acres - square mile) 20 deer. Your herd dynamics (buck:doe ratio-wise) is 3:1.

Do you try to keep the overall numbers at the carrying capacity? Or....do you shoot does and try to get your buck:doe ratio more in balance?

I understand it would be nearly impossible to KNOW the exact numbers.....but in a perfect world....which would be your primary focus?