As others have said, your intended use makes a big difference.
I have the SAS Titanium Arbiter. Mine is a TOMB (thread over muzzle brake) mount style, so each gun I run it on (up to .30 cal magnums, down to .223) has this type of muzzle brake on it.
It's a great suppressor for my precision rifles, and does fine on AR-15's within reason. But, if I was going to do repeated mag dumps, one after another, or run it on a full-auto, I'd have chosen the heavier but more heat-friendly steel version. Conversely, the lighter weight of a titanium can is more preferable for precision work, since the lighter weight generally seems to result in less POI shift.
I love my SAS can, and have also shot Thunderbeast cans in the past (they're great too).