BTY, I conducted an extensive internet review of all opinions on steel vs. titantium about two years ago from people who rode both.

What I learned from this exercise was that:

1. They almost universally perferred titanium;
2. Almost all claimed that titanium offered a smoother ride;
3. About 80% claimed that steel was stiffer for doing hills.

Now, we know that these results will be different if changes are made in tubes size, thickness, geometry, and so forth. But I thought that these results were interesting in terms of how the bikes were actually built, and not just some hypothetical build.

Given that the typical primary design parameter for titanium is light weight, the results are as I would expect. Obviously, it is possible to make a titanium frame stiffer than steel, but apparently that it is not actually being done most of the time--according to people who ride both.