Local Storage and Cache .. Which is better?

Ionic Framework ionic-v3
1

Local Storage and Cache which is better to save login details.? Is there any difference in them
And how to save data into cache.
I did save data into local storage successfully using the following code :

localStorage.setItem('user',JSON.stringify(this.responseData))
2

What do you refer to by “Cache”?

Also have a look at Ionic Storage which is simple to use and can use different backends (like the ultra stable sqlite on native platforms): https://ionicframework.com/docs/storage/