I've had a DC5, S2000 & 350Z so I may be able to help a bit
I went from my DC5 to S2000 & regretted it so much, the S2000 just lacks power & doesn't drive brilliant so I sold it after a couple weeks! Few cars later I got my 350z & absolutely love it! Awesome cars! Great bit of power & so much fun to drive plus they sound AWESOME!
Only way u will be able to tell is by driving the S2K & a zed but I know u will choose the zed