Choosing a sneaker you run or exercise in is a big decision. If you find a brand that you like, and it fits well and prevents foot pain, it's a good idea to stick with it. On the other hand, if your sneakers are causing blisters or any other painful condition, you may want to think about switching to a different brand.
There are so many kinds of sneakers out there. It looks like Fitsugar readers love Asics sneakers as their number one brand, with New Balance in second place. I thought more people would have voted for Brooks, but I guess it's totally personal preference, and when you find what you like, there's really no reason to buy anything else.