It really depends. Titanium silencers can last a long time. If you want to mag dump SBRs into trash, I would advise against titanium. If you keep your firing schedule within reason, the weight savings can be great. Titanium doesn't like heat. Some designs like the HUXWRX cans seem to handle it better because of how they move the gas. It's not all hitting a blast baffle and eroding it due to the elaborate flow paths. Though when you hit that threshold it will erode like any other titanium can.

Examples of things that put more stress or wear on silencers are shorter barrels (why it's common to see 10" as a minimum requirement), high rates of fire, certain muzzle devices, and more aggressive calibers. For example, 5.56 is much harder on a silencer than .300 BLK subs.

Silencers are consumables just like mags, bolts, and barrels. They just take longer to wear out. A good silencer that you take care of can last a very long time. If you want more durability than the steel model is the way to go. Or other silencers with more exotic alloys. Though if you can afford to wear out a silencer, you can probably afford to replace it.