IMHO, you should stick with SFS unless you find some serious problem with it that the author cannot fix. (With PFS you don't have that luxery - PFS is no-longer developed.)
I switched from PFS3 to SFS, and haven't looked back. Yes, it's *slightly* slower, but it seems more stable to me & less prone to corruption (although I haven't done any scientific comparisons).
Oh, and the SFS defrag util is great. I don't think that PFS had that feature???