The debate of FWD Vs RWD is basically moot for this site because Mercedes sells no FWD cars in the U.S. Mercedes only recently produces a FWD car, the A-Class. The A-Class is a Mini-Car built for a niche market overseas where gas prices are high, parking limited and the streets are narrow. RWD may be better because it has fewer negatives. FWD is only superior in snow. If you need superior snow traction you are limited to the Mercedes M-Class SUV and the E320 4-Matic. You find more FWD cars because most affordable/in-expensive cars are FWD. I used to own and love Volvo cars until they stopped making RWD. High performance cars and ultra luxo-cruisers are usually RWD.
The following make no FWD cars: Mercedes (except A-Class), BWM, Porsche, Jaguar, Lamborghini, Ferrari, Aston-Martin, Bentley, Rolls-Royce, Maybach, TVR, Lotus etc. Honorable mention to Corvette, Camaro, Mustang, Viper, Prowler, Lexus LS, GS and upcoming IS, Infiniti Q45, Lincoln LS etc. If your ultimate dream car is on this list you have answered your own question! Take care Chris H.