If you're asking whether it'll out-perform a 15" W3... No matter if you bought Aluminum's or Ti's, you're gunna see a change for the bettter.
I heard (2) 12" Aluminum's recently... very impressed. Amazing ly clear with enough SPL to please 95% of people (the other 5% consisting of mostly CAF.com users lol).
If you can justify spending what the Ti's cost, get them. If not, look around for the Aluminum's... even my local shop was selling them for $200 a piece