They are similar in speed and personal preference which one is "better." The Z is more technologically advanced, with reverse on all years, twin cam liquid cooled motor and rezzies on front shocks on 05+ models. 2009+ models have EFI. There are also Kawasaki (KFX 400) and Arctic Cat (DVX 400) versions also made by Suzuki. I think the 'Cat version looks the best.
I had friends that had 400ex's years back in the pre 450 era and they really liked them. I never owned one myself. I did own a KFX 400 for 8 years with no issues other than regular maintenance. Only sold it to get a Kawi 450R.
I think both 400 models are great quads.
I've owned many Hondas over the years, with 2, 3 and 4 wheels.
Im always buying and selling projects and parts
Last edited by dr. feelgood; 01-26-2017 at 09:51 AM.