I broadly agree with Docwra on this one.
My experience with the S2K is from one very extended road test and one trackday at Anglesey. After the road test I then drove a 350 ragtop and decided straight away that was the right car for me, but on track the S2K was a billion times more fun than a stock 350. The S2K is a great car, and much like the 350 we'll never see another one like it again, but at the same time on the road it did get a bit weary waiting for the power if you weren't trying to be on it all the time.
Of course that was flipped round on track, where the lower weight and the desire for revs made it so much more fun to thrape. As Doc says a Stook is harder to provoke by a considerable margin (even after the horror stories of a snappy chassis), so it depends on whether you want neat and tidy or sideways everywhere
Splitting hairs though really, both cars are immense and I'd love to own either an S2K or another 350 in the near future.