I think you're asking an interesting question, who doesn't discuss this among friends over a beer? So you ask a resource to get more opinions.
Only issue is that it hints toward street racing, which the site owner (david) and the moderators do not condone. It attracts the ricer fun boys like flies on sh_it, and they are about as annoying as a trip to the DMV. Lots of talking, but terribly irritating.
There is a better way to ask this question:
In 1/4 mile drag racing, with identical drivers, which car is faster?
Next step is to have this thread moved to the Motorsports forum. As long as your question about car vs car is asked within the context of a sanctioned racing event, you will get more meaningful answers from well meaning members.
My answer to the revised question? Stock vs Stock, the RSX-S is probably faster, maybe half a second in the quarter or something like that.