I've been a Speed Disk user since way back in the day, but with OS X I'm not sure what to use.
Speed Disk 8 seems to do its job perfectly, but I don't know if it does a better job than Drive 10's optimization. Speed Disk can optimize "specifically for OS X", and optimize directories, wipe free space, etc. But does it do Disk Fragments? Drive 10 does disk fragements. But what about results? Does anyone have a say on which does a better job on optimization? Thanks.