Four of the best selling luxury SUVs, including the Lexus RX 350, which defined the segment back in the late 90’s duke it out in 2019 to see which of the four is the best. The Cadillac XT5 replaces the aging but reliable SRX, and has been an immediate sales success, only being bested by the RX. The Audi Q5 is a solid all around performer with a more unique powertrain versus the V6 engines in the other vehicles. Finally, the Acura MDX sets a surprising value standard. Which one is the best? Watch until the end to find out.