Whether it's the new ones making waves and covetable items we want now, or the labels that have been around for a while and still stay on top of the game, there's nothing wrong with brand loyalty. But what makes one brand better than another? Well, as far as style is concerned—that's totally subjective.
What one person thinks is totally awesome another might think is way corny. Hell, just look at some of the comments on Hypebeast. While there is no clear definition of what makes a brand "good," you certainly have a good idea of what you're into, what you want to look like, and what kinds of designers and labels can help you do that. The only brands that really matter are the ones that you identify with—whether you discover them online or in the real world makes no difference.