Cadillac CT6

This large sedan possesses some athletic chops and has a steady, controlled ride and a very quiet interior. Most buyers will opt for the mid-level nonturbo V6, while the top trim carries a 404-hp twin-turbocharged V6. The eight-speed automatic is smooth and responsive. All-wheel drive comes standard with the V6s. The interior is posh and roomy, but cabin storage is a bit scant. Despite improvements, the updated CUE infotainment touch screen is still unintuitive.