They're both rear-wheel drive, and they're both very fast – but which is faster?

The McLaren 720S and Porsche 911 GT2 RS are two of the fastest supercars on the market right now – but which one is quicker in a straight line?

A new video posted on YouTube by Motorsport Magazine aims to answer that question, pitting Britain against Germany in a winner-takes-all drag race.

Power in the McLaren comes from a 4.0-litre twin-turbo V8 making 530kW of power and 770Nm of torque, while the Porsche makes 515kW and 750Nm from its twin-turbocharged 3.8-litre flat six.

Both vehicles send drive to the rear wheels via dual-clutch automatic 'boxes, and both claim to sprint from 0-100 in less than three seconds – the Porsche in 2.8 seconds, the McLaren in 2.9.

They're very closely matched on paper, but we all know that doesn't always translate in the real world.

Have a watch below, and let us know what you think in the comments: