FreeCommander / FastCopy

When moving/copying files, whether within the same drive or slave drive or to USB Portable drives, which is the better way to go FreeCommander or FastCopy ? I think they use different ways to do it and have faster abilities and or more or less errors. I also wanted to know about what setting is better for FreeCommander in the File/Folder Operations section of settings, you can tell it to "Use Windows" or "Use FreeCommander", what's better there ? Which is why I posted here instead of in General. Fast copy uses its own I believe making it faster, better, fewer errors etc, Not even sure I get the real difference between the 2 programs yet.