Difficult for me to give a clear answer. They may have almost the same engine but the behavior of the chassis is completely different. I never experienced a s2000 prepared for track days so the handling is not comparable with the fn2 I had. Anyway the s2000 give you more pleasure but to be efficient, a lot of parts needs to be changed. The fn2 is easier to drive and give you more confidence so you can push a lot. To do that with the s2000 you need to train and have experience.