I like Kanotix very much. The main difference between it and Knoppix is that it is closer to a purely Debian Sid than Knoppix which uses a mix with testing (Sarge). I run both BugHunter7a and the older BH4 after switching from Knoppix. I just wanted something a little closer to Sid to make for easier upgrading and Kano's scripts especially for installing kernel source are wonderful.