Do you have a CNC? If not, you do not want to use solid carbide spirals (up/down/comp). If you do have a CNC, then I can give you any and all info you could possibly want to know about any and all tooling for a CNC. (I work for a company that manufactures, services, and sells industrial woodworking tools).
If you're using a hand router, just go with a good quality 2-flute carbide-tipped straight bit with plunge tip.