Aston Martin DBX707 vs Bentley Bentayga Speed: Which To Buy

The stopwatch gap is smaller than the character gap, and the character gap is enormous.

The DBX707 takes the AMG-derived 4.0-liter twin-turbo V8, fits larger turbochargers and Aston's own calibration, and sends roughly 697 horsepower through a 9-speed wet-clutch automatic. That gearbox is the underrated part. A wet clutch swaps gears harder and faster than a torque converter, so the car snaps between ratios instead of easing between them. Combined with an electronic limited-slip differential and a rear-biased torque split, the DBX707 behaves like a very large sports car. Aston did not build it to be a comfortable SUV that happens to be quick. It built it to be the quickest thing in the class and let comfort follow.

The W12 Bentayga Speed comes at it from the opposite direction. Its 6.0-liter twin-turbocharged W12 makes 626 horsepower and 664 lb-ft, and it delivers that in one enormous, seamless shove with almost no drama attached. Twelve cylinders in a compact W configuration produce a smoothness a V8 cannot replicate at any price. There is no theater. You press the pedal and the horizon arrives.

The honest read: the Aston is quicker in a straight line and dramatically more alive through corners. The Bentley is the one you would rather cover 600 highway miles in. Compare live examples of both on the DRIP inventory page.

Picture the same Tampa week in each car: school run, a client lunch downtown, then a run over the Skyway to Sarasota. The Bentayga wins three out of three, and it is not close.

Bentley's cabin is the reference point for the entire segment. The materials are genuinely better, not just more numerous, and the assembly quality shows in the details you touch daily. Ride isolation over broken pavement is superior, road noise is lower, and the rear seat is a place adults ask to sit. Specified with the rear comfort options it becomes a legitimate chauffeur car.

The DBX707's interior is a large step up from the earlier DBX and still finishes second here. It is more driver-focused, with better seats for hard cornering and a more purposeful layout, but it rides firmer and it lets more of the road in. That is the direct consequence of the chassis tuning that makes it the better driver's car. You do not get both.

Cargo and towing favor the Bentley slightly, though both are genuine five-seat SUVs with real trunks, which is what separates this pair from the four-seat raised grand tourers in the segment. Whichever way you go, nationwide enclosed delivery puts the car in your driveway.

Both depreciate. The shapes of the curves are different, and that difference is worth real money depending on when you buy.

The Bentayga Speed followed a conventional luxury-SUV curve for most of its life, which means the steepest drop is absorbed by the first owner. Buying a two to four year old example is the sharpest way into one. The end of W12 production has flattened the back half of that curve for well-kept, low-mileage cars, so the very best examples are no longer falling the way they were.

The DBX707 depreciates like a current-production performance SUV, which is to say meaningfully. That is a cost if you buy new and an opportunity if you let someone else take the first hit. Aston Martin's smaller production volume keeps clean examples from flooding the market, but it does not create the kind of scarcity that pushes prices above sticker.

The practical takeaway for most buyers: neither of these is a car to buy new unless you want a specific factory specification. Both make far more sense lightly used, and the money saved covers years of the maintenance discussed above.