After driving my 89 YJ (leaf springs) 100 miles round trip on expressway. Then I drive a 04 LJ (coil over)on the expressway. I have to say the YJ feels like a Buick compared to the LJ. The LJ on 33 Mickey Thompson MTZ and 4" lift, The YJ on 33 Goodyear Wranglers MTR with 4.5" lift. The ride felt softer on the YJ and Quieter for sure. The LJ didn't handle bumps well. That jeep jump all over the place. The YJ steering was better on the bumps. The YJ took corners better also. When TJ owners drove my jeep and said it drove nice,now I no why they say that.
The LJ can speed up to 75 miles, the YJ only get up to 65 MPH. I guess it depends on the suspension mods and tires, that dictates how the Jeep rides. I felt like I went thought 12 rounds with Tyson after driving the LJ. That jeep beat the crap out of me.