I'm currently running both. Projects for OpenBSD on sparc/sparc64 are very rare, but seti has them.
I'm running 2 instances of F@H on my dual p3 because it works. Although, I am probably switching one of the CPUs to lifemapper in the future (next day or two).
They're all "worthwhile."
I also try to run an ecryption cracking program or two. md5crk is working quite well. Thinking about writing a FAQ.

(not to push another project on anyone)