That's a different article. Many companies don't want to do comparisons because it upsets one or more advertisers. It's also very hard to do a good objective review since many of us use the products in slightly different ways or have different expectations.
That being said, the value of the various data virtualization options is complex. I work for Redgate, and Provision doesn't do nearly what Delphix does. That being said there's a $$ v $$$$ difference. Is it worth it? Very hard to say. I would have to see an environment to recommend one or the other.