A 59er. The 1998 Grand Cherokee with the 5.9L was the fastest SUV until the SRT-8 model came out. They have a very cult fallowing in the Jeep community, esp the Grand Cherokee guys. I don't know much about the Durango other than I liked them. Durango's are bigger (3rd row seating) and weight more, so they will probably get a little less mpg. Also the Durango is built off the Dakota, so they are known to have ball joint problems and it will ride more like a truck with the leafs in the rear.