I vote 9.1 due to it being mac and there is classilla for web surfing.
I did try Ubuntu on a Dell but the disk would not load, and Kubuntu worked but it sucked. I really did not like the GUI when I was trying to find file management.

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I did, and do, run Knoppix under VPC 6 for Firefox 3 using custom boot args. It's slow as, well, something that is extremely slow, but it works if I have no choice and desperately need to view a site that doesn't work right in Classilla yet. Knoppix hits a few of VPC's bugs when trying to install it to disk, but it runs from the LiveCD well enough, and LXDE doesn't kill the emulator. That could be a best of both worlds approach for people, if you have VPC, so for me I'd choose 9.1 also. (For that matter, I could also get Damn Small Linux and Puppy Linux happy, but straight-up Debian and Ubuntu both went bang, and FreeBSD was also not happy.)

For the interested, the magic words to lilo were: knoppix i8042.noloop xmodule=fbdev screen=1024x768