I have researched from the web for comparison between titanium (Grade 5) and 316L stainless steel, the 2 commonly used material in watches. The data shows that titanium is more superior in terms of light weight and strength compared to stainless steel but hardness (Rockwell B) is only 1/2 of 316L. The many feedback from articles in this forums however says that stainless steel watch scratches more easily than titanium watch which contradict my data from the web. Perhaps members that has watch/watches in these 2 versions will be able to enlighten me on this issue.
Note that there's two grades of Titanium used for watches - Grade 2 and Grade 5. Grade 2 is softer (yes, even softer than SS) and cannot be polished, while Grade 5 is much harder than SS and can be polished.
Having owned the SS and Titanium (Grade 2) versions of basically the same watch, my thoughts:
SS - polished, heavy, more dressy/bling, scratches easily, can be polished - but to look new needs to be professionally done. DIY with CapeCod is a hell lot of work due and can't remove the micro scratches.
Ti - brushed, light, more understated/rugged/tool watch, scratches just as easy, but easy to get rid of scratches to look new with just a scotchbrite pad (DIY).
I'm really enjoying the recently acquired Ti much more than the SS. Just has a different charm to it and i'm a klutz so I tend to get scratches on my watches easily.