I think you should pick how to hold depending on your specific situation.
At the net .... Conti always.
At the baseline or for serve return I hold it in my forhand grip. I used to keep it in a BH grip for my OHBH becasue I wanted to be ready for Backhands. However, my pro noticed that I transition from FH to BH quicker than I transition from BH to FH.
And I always just spin my grip hand ... never with off hand on the throat.
"You should be playing linebacker, not singles."