I used many pounds of Bullseye, and currently have ~12lbs bequethed to me by a friend after he passed. It was 18lbs before last PPC season!.
I've also used a lot of win231. It's best at 2.9gr for ~690fps. I've got a couple of PPC nat. records with that load, and several guns I've won.
I wasn't too thrilled with Titegroup. I got best accuracy at ~2.4gr, but got squibs due to clumping in the measure. Could have been just the lot# I got. After the 2lbs I won were gone, I haven't revisited it.
I really liked WST, but found lot to lot variation to be greater than I cared for. Get it in 8lb kegs, and check velocities/charge weights every time you get some more. 2.9gr also works quite well.
Red Dot is VERY accurate IF individual charges are WEIGHED. However, the extreamly large flake size and small charge required for .38 wadcutters (2.5gr) makes for some interesting shooting when loading with a progressive loader. (READ: snap, crackle, pop!). Too time consuming to load for good results.
VV-N320: good accuracy at 3.4gr, but at nearly $30lb, I'll pass, even though it smells SO GOOD! I won the only pound I've tried, and still have most of it! I plan on trying some in a S&W 642 I won, when it comes in next week- with some 150gr GC-HP cast bullets for ~800fps.
PB! Haven't heard anyone talk about that in 20+yrs. My current PPC revolver was built in '96 by my "mentor" who got me into shooting PPC: He used PB exclusively back in '70's when he was winning a lot of matches. He recommended 3.0, largely because thats what his Star loader was set up to throw. Worked for him! PB looks and performs very much like the VV-N320, just a bit faster though.
VV-N310 is said to be very good, but like N320, quite expensive. If someone was to give me some though, I might change my mind!
So many choices!