Porsche.

There are only 6 fast BMW\\\'s.
BMW M3, BMW M5, BMW M6, BMW Z4 M, BMW 335i, BMW 135i.

All Porsche\\\'s are fast.
BMW M3 competes with Porsche 911 Carrera, the slowest Porsche 911.
And they are equally quick, but the Porsche has a higher top speed and better reliability and quality.

BMW M5 is a sports sedan. Porsche does not make a sedan to compete with it.

BMW M6 competes with Porsche 911 Carrera S, the 2nd slowest Porsche 911. And the Porsche is much faster as proven in the tv show Top Gear.

BMW Z4 M competes with Porsche Cayman S and Porsche Boxster S. In comparison tests, the Porsche always wins.

Porsche\\\'s are much cooler and the Porsche Cayman S is one of the worlds best handling cars.

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