While I don't count fish, I should, I seem to always catch more fish when fishing alone, then when fishing with someone. The down side is that if I have a fall there's no one there to help if I can't get up. On most streams falling isn't an issue, but yesterday it was, I went for a swim 3 times, the rocks were extremely slippery, and there were boulders from bucket size to bigger then a half ton pick-up. All of them slippery as snot.
I still fish alone a lot, but not as much as I used to and some of the places I fish I choose to fish with someone else along with me.