Been using PFS3 most of the time but I gave SFS a try on an A4000 I just put together.
Just a small comment regarding this bit...
SFS has the habit of being quite snappy at first. However, it will quickly degrade to unusably slow state (especially if you have a lot of files and/or perform a lot of changes to the filesystem).
SFS also tends to corrupt itself occasionally. In most of the cases the only way to cure it is to copy the data to 2nd partition, reformat and copy the data back.
In my experience PFS3 isn't perfect either, but is clearly better than SFS.