Every anime fan will have their own view on what the single best anime series of all time is; some fans cite time-honored classics like Cowboy Bebop or recent mega-hits like Demon Slayer or Attack on Titan. There may be no single right answer, but even so, a small handful of anime series keep floating to the top, and there must be a reason for that. Based on fan consensus and even voting on sites like MyAnimeList.com, it becomes clear that just a select few anime series are all but officially the best. One of them is Fullmetal Alchemist: Brotherhood.
Source：https://www.cbr.com/is-fullmetal-alchemist-brotherhood-the-best-anime/
