Given both cars stock the DC5 will be easier to exploit on the track and as a result the average driver will be able to get better laps around a track, also go faster around bends. S2000 will accelerate slightly faster but a DC5 should be able to keep up with the s2000 at higher speeds. DC5 is about 70 kg lighter and should have less transmission losses. I think s2000 feels less torquy at low rpms. This is my opinion. Also i find the R a lot more practical, great legroom both for front and rear and huge trunk to carry stuff. I like the design of interior dash more, i find the S2000' dash outdated.
I disagree. I have just gone from a S2000 to a DC5, and I'm loving my new ride. To get the best from the S2000, road conditions need to be perfect, whereas the DC5 is a lot more forgiving. To be able to get the better S2000's out there (ie. 04 and on), you'll need to shell out quite a bit too.
Also, while the DC5's handling is not *quite* as good as the S2000 (to say it's 'shite' is just ridiculous), it's front wheel drive so that's to be expected. On the other hand, the DC5 won't jump up and bite you on the ass anywhere near as often.
But then my S2000 ownership wasn't the problem free 2 years I was hoping for, so maybe I'm a bit jaded.
Just my opinion, but as I've actually owned both, figured it may be worth something...