I use Anilist because it has the best API. The best API means that it has first-class support across every single app in my anime "stack":
- AL-Chan (Android client)
- MAL-Sync (Webextension)
- Miru (Desktop anime viewer)
- Saikou (Android anime viewer)
- Saikou TV (AndroidTV anime viewer)
- Tachiyomi (Android manga viewer)