I used SFS for about the 18 months before I got a PC (Uni work... I run Linux full time but still have Win98 in a VMware image to use some engineering software).
I have no complaints - it seemed faster with my SCSI setup (booting, anyway), no revalidations (which reduced my productivity signficantly with FFS), and i never had a partition corrupt itself, I cannot say the same about FFS. I tried no DC settings, maxtransfer, masks... it was just that my system was unstable (to a point I could tolerate, low memory) and would cause the HDD to become invalid.
Is PFS free now or something? If not I'd say go with SFS, it's reliability is great (for me) and the speed is good.
- Paul