I love certain distros for certain uses.

Knoppix is awsome for recovering data and such on my clients Windoze boxes

SuSE ran great on my old laptop (Omnibook with a PIII in it) where as Mandrake ran better on my old Dell (PII).

FreeBSD (while it's not a Linux) WOULD be my favorite if I could get it to run on ANY laptop!!!!