Don't be the best. Be the only.
The real wisdom here is about resistance to comparison—Jerry Garcia understood that chasing "best" traps you in a race with everyone else's yardstick. "Only" means you've stopped measuring yourself against competitors and started asking what you alone can offer, which is paradoxically the path to genuine excellence. A musician who spends a decade mastering someone else's style will always be second-best at their game, but the one who develops an idiosyncratic sound—maybe awkward at first, maybe unmarketable—becomes irreplaceable. That's why Garcia's own guitar playing, gloriously flawed and unmistakably his, matters more than a hundred technically flawless imitators.