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google app engine - Store Photos in Blobstore or as Blobs in Datastore - Which is better/more efficient /cheaper?

I have an app where each DataStore Entity of a specific kind can have a number of photos associated with it. (Imagine a car sales website - one Car has multiple photos)

Originally since all the data is being sourced from another site, I was limited to having to store the photos as DataStore Blobs, but now that its possible to write BlobStore items programatically, I'm wondering if I should change my design and store the photos as BlobStore items?

So, the question is:
Is it 'better' to store the photos in the Blobstore, or as Blobs in the Datastore? Both are possible solutions, but which would be the better/cheaper/most efficient approach, and why?

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