NetBSD runs a lot better on 68k Macs with 36MB or less of RAM. Linux is a real memory hog on the 68k Mac. When I installed it on a Quadra with 20MB, it was swap city. When I installed NetBSD it cruised until I started compiling stuff. Then it stuck its tongue out at me and said, "I don't think so." I replied with, "Bah! Wrong answer!" Then I went back to Mac OS -- System 7.5.3 to be precise.
If you wanna run a *nix on a 950 or a IIfx (other than A/UX) your only choice is Debian. Apparently they have the ADB port issues pretty much worked out now. So I think I'm gonna give that a try.