Whilst both materials can give you an excellent ride quality with a well designed and built frame, they are different.
Titanium is obviously lighter than steel and it does allow you the opportunity to use larger diameter and profiled tubes. Using these larger tubes can increase the performance of a titanium frame compared to a similar steel frame without any loss of smoothness or comfort.
Then of course there is the not inconsiderable benefit of almost zero corrosion with a titanium frame.
Come and visit us if you can and you can test ride both materials back to back so that you can experience the differences for yourself.