IMHexperience ...
I've had 2 A1200's, a desktop which lasted around
10 years and which I recently transferred to a Tower.
I've had FFS on my boot disk & PFS on all other disks/partitions.
I've never had an FFS go bad on me (touch wood!) but I have had a problem with PFS. However, in all cases, PFS Doctor recovered the drive & I never lost any data.
Also, PFS drives are much faster but the best feature is the recover deleted files. You can actually recover files that you deleted, up to the 990th one. Works just like another directory.
I have never tried sfs but can wholeheartedly recommend PFS.
IMHO