UPDATED: Persist radio button selection in localStorage populates to all ng-repeat

It depends on how complex is your "database". Once all your data belonging into one big pile/array of objects, you have to alter the detail object and then make sure the whole array will be saved into a storage. It could happened in many places in many views of your apps and it would be really tedious. Mentioned modules/APIs would provide you with a comfort of "advanced" databases even if you are still using a in-browser storages.
If TLDR: using one of the mentioned modules/APIs would make your live much easier