The Windows defragmentation program is perfectly adequate. Other defragmentation software is only advisable if you have special requirements which the Windows defragmenter does not cover.
If you don't know what those "special requirements" might be, then you don't need any other defragmentation software.
The Windows defragmentation software also works with other things in the operating system like boot optimisation. Many other products will not, and using them will actually degrade overall performance.
Various defragmentation/optimisation software uses various methods, including file placement optimisation, to achieve various things. These are theoretical optimums, and depending how you use your machine, this can also actually degrade the system performance.
It is absolutely essential to only use ONE defragmentation program. If you use several, then you WILL degrade system performance, and cause massive and unnecessary wear and tear on your drives.
The best plan for most normal users is to set up the scheduler to run the Windows defragmentation program once a week if you use the machine a lot for copying, downloading etc. Once a month is sufficient if you only run standard software, and don't change programs all the time.
Under normal circumstances you will not notice any difference in system performance after defragmenting,if you do it regularly. However, if you do not defragment a drive for a long time, and you do a lot of copying etc, then the system will become noticeably slower, more wear and tear will occur on your drive(s), and they may become noisy as a result of the excessive head movement required to carry out reads/writes on fragmented files.
Excessive fragmentation causes read/write timeouts and other errors, and if nothing is done about it, the drive will fail quickly.
Excessive DEFRAGMENTATION , using a defragmentation program too often, will not improve system performance, and also causes massive wear and tear on the drive.
Regards....Mike Connor