If at all possible, it might be a good idea to get to a demo day. I know Storm/Roto Grip have them as well as Ebonite, bringing out their 4 brands. I haven't seen a Brunswick one, although I will say I've had an opportunity to test all balls in their current lineup and am pleasantly surprised, not only how well the balls rolled for me, but how well they complimented each other up and down the lineup. It's very easy to know what each ball is meant to do. I've also had a chance to do that with Storm.
As others have mentioned, most of us are not limited to one manufacturer so you may want to look at different manufacturers.
My current personal arsenal has a mix of Roto Grip, Hammer, Ebonite, and Columbia. I've had some Storm, Motiv and 900 Global mixed in as well. However, my personal feeling is that you need to get to know the equipment well to create an arsenal, which is a bit harder if you mix and match manufacturers because you don't know exactly how ball A from one manufacturer compliments ball B from another.
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