That's true, I have test them all
O&O was a good defrag but not really fast for me.
PerfectDisk is the one I was using for about one year now. But I receive many error message with it
This is why since two days, I'm using the latest version of Diskeeper Pro
This is really new for me so I can't give it a really good opinion for the moment. But Diskeeper takes more CPU usage than perfectdisk
Maybe it is doing a more good job ? I will see in the next few days
