W231
I've used W231 with both 147gr and 124gr bullets but I've never tried WSF. The W231 is accurate, consistent and easy to shoot if on the snappy side, but wow is it dirty!
I mainly use HS-6 (which is actually a fairly slow for a pistol powder near the bottom of the top third of all powders, similar to Herco), mostly because I have a huge stock of it. HS-6 is fairly good, not too dirty, some snap but easy to follow up with second shots.
Most of the IPSC shooters here are moving away from the "old school" loads of slower powders like HS-6 to loads using Bullseye, Titegroup and even Clays (as fast as it gets...) Of course there is also a large number of die-hards that won't use anything other than W231.
The light loads of fast powders like Clays can be like shooting a .22 even at 130PF so they may bear further experimentation, but the pressures are definitely a problem. I know several reloaders that swear up and down that they will never touch Clays or Bullseye even again...
I've tried Bullseye but I don't like the obvious pressures signs I get. Don't use Federal primers with a powder this fast, they are just too soft.
As always, this advice is worth exactly what you paid for it, use at own risk.