I, too stand all of them up after sorting. Part of the reason is looking for cracked cases and of course the other is to sort out the ones that don't belong. I also run a magnet over the cases to catch any of the S&B brass-over-steel stuff.
I don't have any trouble spotting the .380s amongst the 9mm. Even if you don't catch them when sorting, it's obvious when you re-size them, cause .380 is a little smaller diameter. It's the 9x18s that are difficult to pick out, which as I said doesn't matter unless you really need the 9x18 cases for your Tokarev.