I think you'll find that the S2 Jim was running was "too quick for his driving style"
He likes a nice slow understeering car (not that I'm saying the X-6 is like that, that's just how he sets his car up) and felt the S2 was too 'on edge' for him like a B4 is. He would not drive a B4 again given the chance!
As always different people like different things. At one point I had the choice of all the current 2wd chassis (before the Kyosho came out). I found the Losi CR very easy to drive but I just couldn't get the lap times out of it, I found you have to drive it at 110% to get the time, which I am too old to do
. The B4 rear end was just a little too random for me and I never had confidence in it
. I tried an X-6 and I went well with it and thought it was an improvement on both the B4 and Losi, but I just couldn't get enough steering out of it for my liking at that time, even though the results were good, but I perhaps didn't give it enough time.
So I decided to build my own car like the original 3 gear S2 and I liked the car very much, to me it was a B4 without the slightly random rear end, just what I was looking for. Now I am running one of Jonathans 4 gear S2's and I like it also, it drives different to the 3 gear and is requiring a different set-up again, but I find it very easy and most importantly
consistant to drive, I can drive it at 90% and use the inherant speed of the car to get the lap times, perfect for my aging reflexes!
Wow, that was a long post, and I hope some insight into all the different cars. The simple answer is there is not one better than the other, it depends what
you like.
G