My favorites tend to rotate depending on what I've played most recently.
I can tell that the Dano '63 reissue is going to be one, and the '64 Gibson EB-0 is guaranteed to be a lifelong keeper. Too sweet a bass to let go of. It will have pride of position next to my '63 P.
I think If I had to jettison everything else, as of this AM I'd keep the '63 P, the EB-0 and the Epi Jack Casady. Three classic sounds, all different.