brushless will dominate over nitro.  You can put the best italian or OS engine in your 1/8 buggy or truggy, but the guy with a brushless setup with at least 11.1 volts will have more power and speed on the track.

Electric vs Nitro... bye bye nitro!
[youtube]http://www.youtube.com/watch?v=OGvwpEm2B7g[/youtube]