This question comes up a lot, and I always respond with Carbon Creek. Is it the best Trek? Hell no. But what it is is a story that requires no knowledge of Trek. Anything relevant to a new viewer is brought up by Tucker or Archer at the dinner table. And it does introduce a new viewer to some key lore about the history of humanity relative to this wider universe, as well as what a wide reach the Vulkan’s had in developing the alpha and beta quadrants.