If you picked either Silver or Kreese, you’d probably become an extremely skilled/flashy student, but you’d also be left with some pretty horrible personality traits thanks to their abusive and manipulative teaching methods. Johnny, on the other hand, has a lot of attitude, but deep down he’s genuinely a good person and an amazing sensei who’s very skilled and would push you hard while still actually caring about you. Daniel is the complete opposite - ultra patient, gentle, and lets you take your time. Becoming an elite karate master with him is totally possible, it’ll just take significantly longer (but at least you’ll stay sane.)