2020 BMW X6 M50i vs 2020 BMW X5 M50i - 2 great SUV's, 1 clear winner

If taking all your friends and their stuff from 0-150 in 26.3 seconds sounds like fun (trust me, it is) than the nice folks at BMW have just the SUV's for you.
The new for 2020 M50i in both the X6 and X5 has 523 horsepower to go with 553 lb-ft of torque.
From Car and Driver:
This year, the big change to the X5 lineup can be summed up in three words: even more performance. BMW has added a fourth member to the stable, the M50i, which pummels the asphalt with 523 hp and 553 lb-ft of torque from its turbocharged 4.4-liter V-8-up 67 horsepower and 74 lb-ft from the xDrive50i's similar 4.4-liter V-8. The M50i package includes a standard eight-speed automatic transmission, an electronic limited-slip rear differential, an M Sport exhaust, bigger brakes, and sportier suspension tuning with adaptive dampers. The X5 40i models are available in both sDrive (rear-drive) and xDrive (all-wheel drive) configurations. The V-8 models come standard with all-wheel drive and receive wireless phone-charging capability and a Wi-Fi hotspot standard.
Since the BMW X6 was launched, naysayers have denounced the genre-bending design as impractical and even pointless. Dubbed a “Sports Activity Coupe,” the X6 threw out the checklist of what makes a good utility vehicle and instead aimed to provide a sportier appearance, personality and overall experience. Now, more than a decade later, BMW has proven to be more trailblazer than outcast, as multiple competing (and non-competing) brands have launched their own versions of what are now known as “crossover coupes.” As an all-new, third-generation model, the 2020 BMW X6 doubles down on its core philosophies and improves in nearly every way.
Although bookended by the six-cylinder 40i models below and X6 M model above, we had access to the X6 M50i powered by a twin-turbocharged 4.4-liter V8 that makes 523 horsepower and 553 pound-feet of torque. That's a massive improvement of 78 horsepower and 73 lb-ft of torque from the previous V8-powered X6. With a curb weight of 5,115 pounds, the new M50i is significantly heavier than the 4,784-pound, six-cylinder xDrive40i, but its quick-twitch demeanor off the line, taut suspension, and light steering hide that fact. The twin-turbo V8 cranks out gobs of power readily available across the rev range, thanks to a consistently decisive and accurate eight-speed transmission standard on every X6.
Throttle tip-in is early, steady and even, and a full stab will snuggle the driver into the seatback. BMW’s official 0-to-60-mph claim is 4.1 seconds. With “manual” mode activated, sturdy paddle shifters call upon calm, quick shifts. An aggressive but contained soundtrack alerts passengers and passersby of something feisty under the hood and exudes the X6's intended impression.
The steering characteristics, unfortunately, do not match the thrilling powertrain or the emotional design. While light and easy to maneuver, there’s a bit of a dead spot on center, and turn-in is a little lazy. A tinge of road vibration comes through the wheel, possibly due to the 22-inch wheels, but the overall feel is numb and disconnected.
The Fast Lane With Joe Tunney
Luxury cars 2020
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This BMW's greatest feature, however, is its powertrain. The twin-turbo 4.4-liter V-8 is essentially the same unit found in the M5 and X6 M, just with less boost. It's rated at 523 horsepower at 6000 rpm and 553 lb-ft of torque at a low 1,800 rpm. With its launch-control system activated, which allows you to rev the engine to 2800 rpm before releasing the brake, our test vehicle shot to 60 mph in 3.8 seconds. That result may be a mere tenth of a second quicker than the X5 M50i's, but it betters the X5 xDrive50i's effort by 0.3 second and is 0.9 second quicker than the last X5 xDrive40i we tested. Our X6 M50i blitzed the quarter-mile in 12.3 seconds at 113 mph, slightly beating its X5 counterpart's time and trap speed and essentially matching the straight-line performance of the previous-gen, 567-hp X6 M up to about 120 mph.
Top speed, as fitted to our car with the optional summer performance tires, is governed at 160 mph. BMW's V-8 is wonderfully smooth, even when pulling hard to its 6500-rpm rev limiter, and the authoritative V-8 rumble emitted by the standard M Sport active exhaust system provides a rumbly soundtrack. Similarly, the ZF-sourced eight-speed automatic is tuned to perfection, with smooth but snappy gear changes that always seem to have the X6 in the right ratio.