Since I love being a reductive asshole, Periphery is more successful commercially because more people like them than those other bands. When I auditionee for music school, my playing was not fantastic. I got piss poor audition scores, though, which I thought were much worse than I deserved. Some of the other people auditioning flubbed pretty bad, but simply weren't as boring as me, and got much better scores. Because music is a popularity contest, essentially.