Okay, being a HUGE Mercedes-Benz fan, I've looked at and researched almost every one of thieir cars. Now, the BlueTEC is better for the environment, and looks better, plus it has lots and lots of luxury. On top of that, MB backs their Certified Used cars with a 2year, 135,000 mile warranty, should anything go bad. Now MB almost went out of business in the early 2000s, due to drop in quality. However, that was from about 2002-2005. Everything past that is really well built. I would love to have the BLUETEC, but don't have the money right now. So, the BlueTEC is most likely the better of the two. Good luck, and God Bless.