If someone wants your very best version, that probably means that they're going to get the same version that you've done before, the same as the best version you produced a week ago. If you want the best, it also means that you're asking someone to repeat what's come before.
On the other hand, if they want you, right here and right now, it won't be perfect. It can't be. It will merely be different and real and in the moment.
The opportunity in any given moment is to share your truth, to light a spark and to leap. But you can't do that at the same time you're being perfect.
Artists end up with clients, customers and supporters that don't demand the best. They merely demand the truth.
There is no best jazz performance. That's why it's interesting.