There isn't really a best CDFS. They all have strong points and weaknesses, but some you should avoid anyway.
Best ones: AllegroCDFS, AsimCDFS.
Good ones: CacheCDFS, AmiCDFS.
Okayish ones: cdrive.filesystem (on BPPC cards).
Ones you shouldn't use: CD-Filesystem (OS3.1 version).
I don't know why you have 8+3 problems with AmiCDFS - it always worked ok on ISO-Amiga for me.
Allegro is my favourite and I use this, but it only works on Elbox hardware like 4-way IDE adapters. I've never used Asim but I hear good things about it. Cache is good and comes with OS3.9, but it's kinda slow and has some prefs bugs.
