I am unaware of any such comparisons. However, any true comparisons of these products would have to be done in context. In other words, they would have to be done based on the requirements that are important to you. For example, most comparisons would not even mention ESCON/FICON.
The only way for you to know the correct answer to your question would be to try TCP-based backup in your environment. Just make sure to give it a fair shake by using a professional who understands the product as well.
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This was first published in December 2002