We use Martelli (me) blades and Clover (she) blades for our shop cutting. The Martelli blades outlast the Clover blades by 5 or 6 to one. Olfa blades haven't done as well as Clover. And the Martelli blades get more use. I'll never use anything else again, they're well worth the premium price.
Never tried the titanium blades though.