My favourite to use is bruiser (so called because he is black and blue)
4sq foot of soft 4oz calf leather, cut 24″ long and 1″ wide.

He is pretty much an all purpose flogger and is loved by everyone I have used him on. Big, heavy and thuddy, what’s not to like?
And yes I assign names and genders to floggers, so that I remember which one a customer is talking about.
I tend to use a big “forehand/backhand swing for power, but mix it up a lot during the course of a scene depends on who I am flogging and what they like and want.