Its really a personal preference, when it comes to what companies/company each person chooses to throw. There seems to be a general consensus though of a few brand that just aren't as good as the others though (Quest, Aerobie, Halex, Lightning, Ching). But you really can't go wrong with Vibram, MVP, Discraft, Innova, Lat 64, DGA, Dynamic Discs, Westside, Discmania, Millennium or Gateway. I've noticed that most people tend to throw a mixed bag (multiple companies). The exceptions to this is that if a person is sponsored by a company they usually only throw that brand, but many are allowed to throw other companies associated with that company as well. For instance Innova sponsored players are allowed to throw Innova, Discmania & Millennium discs. DGA sponsored players can throw DGA & Discraft. Lat 64 players can throw DD (Dynamic Discs), Lat & Westside.
Destroyer - PD - Firebird - Teebird - Leopard - Atlas - Roc - KC Aviar