Well 1024 blocksize is a must with FFS, and a massive speedboost once applied. The docs for pfs and sfs do however say there Optimised for best performance with a 512 block size.
I stick with FFS though since its faster/more relighable/compatable on my 040/25. quite an annoyance to be pesterd with sfs requestors on boot saying some blocks are in the wrong place or bad. FFS hasnt given me such problems.
