"The Best", most accurate sort for absolute uniformity would be by case capacity. It is a slow way to sort brass.
If I decide I need to sort, I sort by weight of fully prepped brass, which is close enough for me.
Sometimes I will take ten cases of the same weight and check water capacity; I've never found enough variance to make me switch from weighing to checking capacity.
You don't have to use water to check capacity. You can use fine sand or a fine ball powder. I use A2230 powder. No wet cases to dry after checking.
