The main reasons to burn Avtur IMO is a reduced risk of immolation in an accident + reduced greenhouse emissions.
That might be true in the tame parts of the world, i.e. (parts of) Europe and North America, but if you want to fly anywhere more interesting then fuel availability means that an aero-diesel is a no-brainer. The SMA first generation one has a couple of annoying flaws, and we all know about the issues with Thielert, but more modern engines are looking pretty good.