And what about Diskeeper and O&O Defrag? I'm thinking about O&O Defrag, it seems good. When it runs in the background, does it eat a lot of system resources?
No it doesn't. It's a fantastic defrag tool, actually they both are. Another one is PerfectDisk which is my personal favourite. These 3 are generally regarded to be the best defrag tools out there. That is out of the paid ones. The free defraggers out there are usually decent enough, but if you want features such as strong boot-time defrag, mft defragging, scheduling, layout.ini boot optimization, pagefile defragging, directory placement etc. etc. you need to go with one of the paid ones. Select the one which fits your needs best. There is no best one for everyone, just as there is no best looking girl or best looking car or best av or best fw etc. . It depends on the persons needs/views ...
free defrag tools:
PageDefrag *
Contig
Auslogics Disk Defrag *
Defraggler *
IOBit SmartDefrag *
DiskTune
DefragMentor Lite CL
fragdown
HDiskDefrag
JkDefrag **
MyDefrag *** (write your own scripts and do whataver you want with the defrag engine, it also defrags the mft and has wicked boot optimization based on layout.ini)
Multiple Applicator
Partition Logic
Power Defragmenter GUI *
Quicksys DiskDefrag
Rapid File Defragmentor Lite
SpeeDefrag
SpeedItUp FREE
Ultimate Defrag 1.72 *
UltraDefrag * (has a boot-time defrag but was pretty buggy with the first version though i hear it's quite stable now)
UnityPro Disk Idle Optimiser
WinContig
Windows PowerTools
Maybe i left some out but that should be enough for you to play with.
The ones that i put an * next to are my personal favourites.
Paid ones:
Too many to list i'll just list the good ones !
Puran Defrag *
PerfectDisk *** (Defrags metadata files aswell which is something that i haven't seen with others)
UltimateDefrag *
Diskeeper *
O&O Defrag **
Paragon Total Defrag * (Only defrag i know that actually defrags the ENTIRE partition and everything on it but you have to run it off the cd and it takes years to finish)
Vopt *
Have fun !