Only ever shot it once in Germany, but by far the best paint I've shot in ages has got to be Severe.
After that, Blaze seems to work well most of the time (that was the green & white we shot in Birmingham Kenny) but it can have its off days.
Anything that is consistent in size, shoots straight, has a good fill and is brittle is all good for me!
(And yes, I know that's what everyone is after in a ball!)