I test drove both back in 2003. I knew that the 4Runner was the truck for me, but my parents were on the market for a new SUV too, so I took a spin in the GX when they looked at it. Nothing can compare to that interior of the GX. The wood trim, leather, and controls are luxurious and look good. Lexus makes the best interior's by far. I did not like the design of the exterior though. The 4Runner looks a lot more rugged and I like the liftgate better. As for the ride, the Lexus was much quieter (like a luxury sedan), but you felt the bumps just as much as in the Toyota.