I’ve never considered titanium an upgrade over stainless steel. It’s lighter, yes, but it’s also softer and very prone to dings and scratches. I collect knives and have many with titanium handles and can tell you that just contact with skin oils leave imperfections (referred to as “snail trails”) on it. Does stainless scratch as well? Absolutely, but you can always polish them out, not so much with titanium. Aluminum is also lighter than steel and exhibits the same wear characteristics as titanium (even though titanium is generally stronger overall) but is considered the inferior material for watch cases. Go figure.