Two significantly similar cars, no doubt about that. Still, each one has something different to offer. Having both cars powered by diesel engines and utilizing the 5-door MPV body style within the same 'MPV' segment, the only major difference here really is their wheel drive configuration (front for the Seat and rear in the case of the Mercedes Benz). The first one has a Volkswagen-engineered powertrain under the hood, a 4-cylinder, 16-valves 140hp unit, while the other one gets its power and torque from a 6-cylinder, 24-valves 190hp engine designed by Mercedes Benz.

The fact that the Seat got tested by the European New Car Assessment Programme (Euro NCAP), while the other contender didn't, puts it sky-high safety-wise, in my eyes at least. That aside, let's consider some other aspects which affect safety. Both vehicles belong to the mpv segment, which is generally a good thing safety-wise, but it doesn't do much to help us decide between the two. On the other hand, taking kerb weight as an important factor into account, the German car offers a potentially life-saving difference of 42% more metal.

Reliability is not the best thing to consider on the make level, but it is worth mentioning that Seat does have a slight advantage, all the models observed together. These are the results of an independent reasearch, while our visitors describe reliability of Seat, as well as Mercedes Benz, with the same average rating of 4.4 out of 5. The same official information place Altea as average reliability-wise, and R is more or less at the same level.We should definitely mention that owners of cars with the same powertrain as the Spanish car rank it on average as 4.3, while the one under the competitor's bonnet gets 4.4 out of 5.

Mercedes Benz is a bit more agile, reaching 100km/h in 0.5 seconds less than its competitor. In addition to that it accelerates all the way to 210 kilometers per hour, 14km/h more than the other car. When it comes to fuel economy an obvious choice would be the Spanish car, averaging around 6.1 liters of fuel per 100 kilometers (46 mpg), in combined cycle. That's 48% difference compared to the German car!

Seat appears just a bit more reliable, although the difference is truly marginal. 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, the Spanish car offers much better overall protection, which launches it ahead of the other contender. From there things take a different direction, with Mercedes Benz offering somewhat better performance, just enough to call it quicker. It does come at a cost though, and that's the fuel consumption... All together, there's not much more to say, in this case I wouldn't even consider anything but Seat. 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. In case you have two minutes to spare I invite you to define your needs, desires and budget and see which car would be chosen by the virtual adviser™, among more than 12.000 different ones in our database.