You know all about BMW M cars. They've long been the handling and high-performance benchmarks of the industry. BMW has evolved them over the years and the most recent results are the new M3 and M4. The latter, however, is today's focus compared against perhaps its most formidable competition. No, its rival here isn't the Audi RS5, but something far more similar and yet very different; the Alpina B4 Bi-Turbo Coupe, with its immediately noticeable 20-inch spoke alloy wheels, a brand styling trait.

Powered by the same twin-turbocharged inline-six as the M4, the Alpina B4 Bi-Turbo delivers 410 horsepower and 442 lb-ft of torque. The M4 produces 430 hp and 370 lb-ft. Both cars scream luxury and countless other creature comforts, but it's the Alpina that's truly special. It's rare and not everyone is even aware of the brand's existence. But still, it's hard to say which one is better. There may not even be a correct answer here, but we'll leave it to all of you to discuss.