Yes, Garretts have higher TBO, burn less fuel, cost less to service and can be run on any fuel pretty much. Diesel? No problem - certified for it. Even Avgas/Mogas is OK once per 1000hrs or so (can't recall the exact number), if you're in a bind. So certainly a more versatile engine than the PT6 where none of this is possible. Drawbacks are that they're noisier, and because they have to spin up the whole gearbox before ignition, they're power hungry and more hot start prone. I've also heard they need a little more service compared to a PT6. Obviously, this is offset by a 5400hr TBO.