Asset Bundles?

Hi

I would really appreciate some guidance on the following.

I am building essentially a media application ...not a game... which lets users play audio or video using vuforias AR sdk. I am using Unity 5.5 and I am targeting iOS and Android.

The amount of content has increased dramatically, so I need to work out a way to download the content. So the initial build is slim enough to get into google play as example.

My question really is about asset bundles and whether they are suitable for my use case:

Basically the app needs:

A)Check whether the content "packs" are stored in the app. IF NOT then..

B)Download content packs and move to directories (i.e for vuforia video needs to be in a specific folder so I doubt I can use the local cache???) 

With this high level overview would you suggest I am best to look at using asset bundles or not?

thanks in advance

ade