You will get opinions all over the place.

Agree that you can have a wonderful or crappy frame made of: Steel/Ti/CF/Aluminum/etc.

In general, other things being equal, a Ti frame is likely to be more durable than its CF cousin. Also, the CF technology, while maturing, is still evolving while Ti is pretty static.

So if you are buying a bike that you plan to keep/ride for more than say, 5-6 years, you probably want Ti. If you are going to be getting something new every 3-6 years you are probably better off with CF.

Personally, I chose a Ti frame specifically because I have a body that has funny dimensions and do best with custom geometry. A custom CF frame is prohibitively expensive compared to a custom Ti frame. (price difference is several thousand dollars)