You may want to think in terms of ceramic vs. steel. Both have benefits/costs. I think ceramics can do low temperatures better because they absorb a lot of heat in the shell/fire bowl.
It is difficult, but not impossible, to keep a bubba keg at 225. However, 250 to 275 is much easier which is ok by me.
Ceramics can crack and are heavy.
Both kinds are very fuel efficient, but I think a bubba keg will probably use even less lump than a ceramic doing similar temp cooks.