LOVE Auslogics Defrag - HATE Iobit Smart Defrag (and I'm an Iobit fan!)
Auslogics is fast and dependable - BUT my favorite thing about the program is how well it works in the background when you're doing other things. Never slows down my computer and works great with 64 Bit.
Iobit would take forever - and when finished I would re-analyze and there would be hundreds of files in need of defraging still. I mean what the hell was it doing for three hours anyway...?
Anyway, just thought I'd toss in my two cents worth ! Good Luck - Tagen