When me and my pool buddies were first learning to play at the rec center, we knew we weren't good enough to play nine ball so we played six ball, generally with part of the bet on the three ball. We also played lots of other games, not just a single game. Strangely, no one played eight ball. The game we played for the room championship was 14.1.
The vast majority of people who play nine ball try to play it like the pros which I think is a mistake for them. They are incapable of running out, so they ought to be riding the money. A few of the smarter C-D players have figured this out.
IMO 9 and 10 B (rotation) games are the only games that tests someone's stroke and ability to run balls. C&D players should not play an A or A+ player for money without a big spot; it is impossible for them to win even if they duck every shot. Ducking strategy only works when both players of equal speed in any game.