For some background regarding some of the specific properties of Titanium, see my
Previous post.
In summary: Besides the fact that a Titanium bridge of the same design weighs only half compared to a brass or steel bridge, the resonance frequencies are expected to be similar to that of brass, while the speed of sound is more like that of steel. Of course, the reality is more complex than this (if starting to take into account the crystal structure of the metal, directional dependencies etc.), but the above could indicate that Titanium has some special sonic properties.
Since I play Fodera and also manufacture these pieces I have personally A/B:d Titanium and Brass bridges on my own Fodera. Although I may be somewhat partial... , there is a noticeable difference, to me that is in favor of Titanium.
My opinion is that it gives a richer sound of each note without compromising the fundamental, especially for the lower strings. My guess is that more of the higher frequencies (overtones) created in the instrument are let through. Of course this is an extremely subjective matter, and may also be influenced by wood choices etc. The bass I have it on is a 36" scale, Emp II, with Walnut body and Kingwood fingerboard.