I obviously have a vested interest in titanium vs stainless. So instead of writing a treatis on why titanium, I would rather just answer specific questions. But the basics boil down to this.
1) in chainplate application titanium is effectively immune to corrosion
making its service
life pretty much forever
2) a size for size replacement will be roughly 5 times stronger than a 316 chainplate
3) a strength for strength resized chainplate can be significantly smaller and lighter
4) a size for size replacement will be more expensive. Though how much depends on a number of factors including size, complexity, and what it's replacing
5) a strength for strength replacement can actually be cheaper, depending on the same factors as 4.