Data we plot are not available elsewhere. Everyone else just plots last trade price without regard to low available volume. Some people in the forum managed to plot order book depth like one of our 4 charts does, but their data are not available as a public web site.
Nobody else has a website that consolidates data in orderbooks yet.
Nobody else consolidated data in trade stream.
Nobody else differentiates between bid and ask prices.
Nobody else consolidates data between exchanges.
All these features are described in more details at https://bitcointalk.org/index.php?topic=82768.0
and at the Why tab of the web site.
So our charts are unique as of now. I don't dare to say they are better - let users decide, but they are not something a user can get for free at another place.