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BMW:

When the E24 BMW 6-series expired with the ’80s, the company decided it was time to take its big coupe upmarket, replacing the 6 with an 8 based on the 7-series sedan. Built to impress, the 8-series was originally offered only with a V-12. It was also priced so high that many 6-series customers couldn’t or wouldn’t make the leap. BMW’s 8-series output totaled less than a third of 6-series production, and the company pulled the plug in 1999, eventually relaunching the 6 in 2003. But now BMW is nudging its big two-door upmarket again.

This next-generation 8 will be more modestly cylindered than BMW’s first: There will be an 840i with a turbocharged 3.0-liter inline-six and an 850i powered by a twin-turbo 4.4-liter V-8—though even the six, which makes up to 335 horsepower in today’s BMWs, will surpass the output of the original 850i’s 12-cylinder. While it must be tempting for BMW to go after the Mercedes-Benz S65, we expect the minuscule take rate of 12-cylinder S-classes will keep BMW from bothering. And we expect the 8’s prestigious positioning to preclude the offering of a hybrid model. Europe will get a diesel, but we won’t. ZF’s eight-speed automatic will be the only transmission choice, and all 8s but the base six-cylinder cars will be all-wheel drive.

IMG:

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Mercedes-Maybach:

After fizzling out ignominiously a few years ago as a stand-alone Rolls-Royce and Bentley competitor, Maybach is resurgent as a sub-brand for Mercedes-Benz. It’s selling stretched S-class sedans under the Mercedes-Maybach badge in considerable numbers, including many V-12s in North America and those plus lesser-engined models in China. Now it’s launching a stunning convertible at the Pebble Beach Concours d’Elegance: Meet the Vision Mercedes-Maybach 6 cabriolet.

Powered by a 738-hp fully electric powertrain, the Vision Mercedes-Maybach 6 cabriolet is said to be able to travel more than 200 miles on a charge. A quick-charging system can add 60 miles of range in five minutes, the company said. There are four electric motors, one for each wheel, allowing for all-wheel drive and torque-vectoring functionality. Performance claims include zero to 60 mph in less than four seconds and a top speed governed at 155 mph.Executed in Nautical Blue Metallic and fitted with 24-inch wheels featuring 26 spokes and a rose-gold center lock, the Vision Mercedes-Maybach 6 cabriolet is the open-top version of last year’s coupe concept that took Pebble Beach by surprise. Up front, a grille with 25 vertical slats represents the new face of the brand. You will see it elsewhere in the future.

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These are two best concepts of both giants Mercedes and BMW. In my opinion both are very good, but im asking you what's your opinion on these cars?