There's very little titanium in any tennis rackets that are claimed to be Ti something. Even the famous Ti series from Head a few years ago were no exception. I don't know exactly how much but no rackets contain more than 5 to 10% of titanium. It's alloy with mostly aluminium. Titanium is simply too expensive to be used 100% to make rackets, even if it's the ideal material.
Graphite has proved to be THE material for rackets. The majority of the rackets being sold these days are made from Graphite. If you read what the manufacturers say about hyper carbon, Ncode, DNX, etc, you'll see they are all carbon, which is what graphite is, yes, the very same chemical element as charcoal.