TiteWAD: (note I'm not talking about TiteGROUP) Extremely fast powder. It has worked very well in .38 Spl and .45 ACP. Very limited load data. There is none for the .38 Spl, I went off the reservation on this one. Honestly, stay away from this powder. It's really, really fast and one can get in trouble real quick. There's better choices.
700X: A fast powder. Makes a good substitute for Bullseye. Hard to meter so be careful if you're using a powder measure. If you weigh or dip every charge there's no problem. I've figured out how to get a Lee Auto Disk to throw it accurately and it's great in the .38 spl with a 125gr LRN. One of the most accurate loads I've ever used in .38 spl.
W231: As the OP
Universal: Another medium burning versatile powder in a variety of pistol cartridges. Similar to Unique but it's cleaner and meters better.
800X: Very accurate in the .41 Magnum with lead bullets running somewhere between mid-range and maximum. Same metering problems as 700X
Trail Boss: Fun stuff for powder puff loads in the .41 Magnum. Recoil like a .38 wadcutter and just as accurate. I dip this powder. It has a strange donut shape with huge flakes. Very bulky for it's weight.
2400: THE powder for the .357 Magnum.
W296: Works well in full power loads for Magnums. A real boomer. #1 powder among attention whores at the range.