When I consider all the options available surrounding buying a disposer, I definitely think about power and noise reduction first. Newer disposers work hard and make pretty much any food easily disposable.
If you are looking for a disposal, you should be aware that name alone isn't everything. In fact, I would say that most people are hard pressed to name three manufacturers of garbage disposals. While the big names have great reputations for a reason, they are not the only ones with a great product.