I think your inquiry is too vague. An 05 WRX is roughly the same price as an 05 RSX-S. Unless you're talking about purchasing a used WRX. Personally, I'd go for the RSX-S. I drove one for a long time while with my ex-gf. They are sweet cars and have limited negatives to mention. I've heard mixed thoughts and experiences on the WRX. With Honda you always get that unquestionable reliability. It all comes down to what you want. The WRX will almost certainly be better in the 1/4 due to the AWD system. The launches are greatly improved. But on the highway, the WRX is no faster if not slower than the RSX-S. Third gear pulls are great in the Acura.

Good luck.