Compare two cars
Compare any two cars and get our Virtual Adviser™ opinion
Dimensons & Outlines
Performance (manual gearbox)
Performance (automatic gearbox)
Virtual Adviser's™ opinion
Two significantly similar cars, no doubt about that. Still, each one has something different to offer. Having both cars powered by petrol engines and utilizing the 2-door coupe body style within the same 'Sports car' segment, the only major difference here really is their wheel drive configuration (rear for the Mercedes Benz and 4 x 4 in the case of the Porsche). The first one has a Mercedes Benz-engineered powertrain under the hood, a 8-cylinder, 32-valves 571hp unit, while the other one gets its power and torque from a 6-cylinder, 24-valves 560hp engine designed by Porsche.Safety
Unfortunatelly, neither of the two vehicles was submitted to the European New Car Assessment Programme (Euro NCAP) testing. This makes it virtually impossible for me to pick one over the other and I'm generally against buying such cars as the safety should really always come first. That aside, let's consider some other aspects which affect safety. Both vehicles belong to the sports car segment, which is generally classifying them somewhere in the middle safety-wise, still it doesn't help us solve our dilemma, does it? On the other hand, when it comes to weight, a factor that most people underestimate, 911 offers a marginal difference of 1% more metal.Reliability
Manufacturers have been building their reliability reputation for decades now and, generally speaking, it appears that Mercedes Benz does have a slight advantage, all the models observed together. These are the results of an independent reasearch, while our visitors describe reliability of Mercedes Benz with an average rating of 4.4, and models under the Porsche badge with 3.7 out of 5. The same official information place SLS as average reliability-wise, and 911 is more or less at the same level.Above it all, drivers of cars with the same engine as SLS rank it on average as 5.0, while the one under the competitor's bonnet gets 3.0 out of 5.Performance & Fuel economy
Porsche is a bit more agile, reaching 100km/h in 0.7 seconds less than its competitor. In addition to that it accelerates all the way to 318 kilometers per hour, 1km/h more than the other car. When it comes to fuel economy an obvious choice would be 911, averaging around 9.7 liters of fuel per 100 kilometers (29 mpg), in combined cycle. That's 36% difference compared to SLS!
Mercedes Benz is apparently more reliable, not too much, but just enough. The most important thing when deciding between any two vehicles should always be safety, both passive and active. In my opinion, everything taken into account, 911 offers slightly better overall protection and takes the lead. It all continues in the same direction, with Porsche offering somewhat better performance, just enough to call it quicker. To make things even better, it consumps less fuel! All together, there's not much more to say, in this case I wouldn't even consider anything but Porsche. In any case that's my personal view, built upon all the data available to me. What should decide here though is the way you feel about the two vehicles, and I hope you'll find my guidelines useful in the process. I suggest you spend two more minutes in order to find out which car, based on your needs and budget, would be picked by the virtual adviser™, among more than 12.000 different ones in our database.