I've tried a whole bunch of companies recently (Storm, Roto, Global, Columbia, Track, Ebonite and Hammer). I had some good success with Roto, Cell Pearl and Nomad were good balls, but I feel I match up the best to Track at the moment. They have really started to make some excellent equipment with the numbers system.
In saying that, all the companies balls were good enough to score with, but I found Storm balls too strong on the drier conditions I face regularly, and then when I did encounter oil I found them too skid/snappy. The Hy-Road was a fantastic ball from Storm because I found it more rolly which got away from their problem of too much skid/snap. I know a lot of people look for skid/snap for ball reaction, but I prefer arcing type reactions.