As far as I know, AniList has better search functionalities and allows korean and chinese manga/animation. While MAL may have larger database of animes. Also they’re owned by a Web3 company now 🫥 at least it’s not an ad company nor US company because they go wild putting data tracking and collection bloating everything all in the name of Data Brokers profits 👻
I don’t own it but I found this one
Go to (https://malscraper.azurewebsites/) and export the lists (anime/manga) you want by entering the source platform and your username on that platform, and download the file.
Go to this Anilist import settings page (https://anilist.co/settings/import) to import the lists (you must be logged in with the account) and upload to the correct section the correct list you downloaded earlier
Or if you follow strict FOSS principles and rather use open-source alternatives, there’s this project on GitHub https://github.com/metacritical/anhilist---