Jaime Fournier, a NetBSD developer, did a benchmark with ruby-benchmark-suite testing Ubuntu against the BSDs..

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Dragonfly 2.9 - With Hammer root filesystem
FreeBSD 8.2 - Default disk layout
Haiku - Nightly build
Linux - Ubuntu 10.10 Server Edition
NetBSD 5.1 - Default disk layout
NetBSD-current - with wapbl enabled on /
OpenBSD 4.8 - Default disk
OpenIndiana 148
The result:
# Totals by shear number of tests won.
Totals Wins by OS
252 nbsd
138 dfly
107 linux
91 obsd
65 fbsd
27 oi
8 haiku
Read more here.