Don't get me wrong there's jackers in all xs but if you get a proper well bred bullx from a good line of grafter to grafter you won't beat them on stuff with teeth & very close 2nd is a wheatonx I've seen colliexs,beddyxs,deerhoundxs & salukixs but none of them will match the gamenest,drive & pain threshold of a bullx or wheatonx that's just my opinion atb cbx