>>95704025
Why not both? It's good to start with familiar territory before branching. That's why most settings have humans, and many have elves and dwarves. You've got the immediately understood (human), a good fallback if someone needs to self insert or is just generally uncreative. Elf and dwarf provide a touchstone for those who are fantasy fans but are not yet invested in (You)r world. Then you can get into your squidtaurs and demi-slugs, for those who DO get invested in your world- and even if no one plays them, seeing them around and experiencing their abilities from the receiving end makes the world live that much more.