Dustin's got that right.......I run MT ET Street radials and Hoosier bias slicks.
My faster times have been on the Radial tires.
BUT......poor track = poor launch (spin) but if they hook it'll be a hard run.
The slicks are more forgiving with track conditions.....poor track means slower times but usually CONSISTANT slower times. With a good track.....still won't beat the radial.
The whole thing I've found with the radials is that if they spin you'll be back peddling to tame it down because they'll keep spinning. So I guess what I'm saying is that if you have a superbly prepped track that you always run on, stay with a radial. If not...I'd personally run the bias slick for consistancy over best ET.
I just bought some new Hoosier bias slicks......first shot in the new season will be on them. Hope I don't surprise myself.