that depends on the data size.
If you have a lot of data, then I recommend you to use the Cordova Sqlite Plugin https://github.com/litehelpers/Cordova-sqlite-storage With that you have then a database.
If you have just meta data, then you can also use https://github.com/litehelpers/Cordova-sqlite-storage and https://ionicframework.com/docs/storage/ in combination.
If you have to crypt data, because of sensible data. For that exists also from the litehelpers a plugin:
Finally I don’t recommend the the local storage without the sqlite plugin.
But well that is purely a matter of taste, I love to work with the plugin.
Hope that helps you.