Before discussing where to watch it, we must understand what you are watching. The Daily Life of the Immortal King (Chinese: Xian Wang De Ri Chang Sheng Huo) is a donghua produced by Haoliners Animation League. It premiered in 2020 and quickly became a sleeper hit globally.
If "best" means – Yes, VegaMovies offers the entire series without a credit card. If "best" means safe, legal, and supporting the creators – No. Crunchyroll or YouTube is the definitive best.