Originally posted by Ragwort
Some chess base products are marketed in the USA in partnership with viva media. That seems to be the difference.
They are identical, except the more expensive one you get a premium membership to playchess.com, and thus get the playchess.com premium content. With the cheaper one, you can still play on playchess.com, but you have to pay for any premium content you might want. It appears that the premium content is mainly training stuff.
Recommendation: If you are going to be on playchess.com a lot and interested in the training presentations (usually by GMs) which are quite good I think, I would get the more expensive Frtiz. Otherwise, I would go with the more cheaper Fritz (black box). That's what a friend of mine did, and he is happy with it.