I've owned an 18 3.6 non and now a 21 2.0 non. I actually prefer the 2.0 but it's basically a coin toss. The 3.6 maybe had a little more umph at higher speed? But the 2.0 seems torquier in city driving. I also like how it sounds like a tractor hah. If I had the 2.0 first I would have got the 3.6 now just to switch things up. Both are winners.