Spy software requires you to be reasonably computer literate to install and configure it correctly, while spy hardware can be installed easily even by those who have never used computer before.
Keylogger hardware can store up to 64KB data, while spy software allows you store up to xx GB data as long as your hard disk has enough free space.
Spy software can also capture screen snapshots, incoming/outgoing emails, both sides of online conversations etc. etc. while keylogger hardware only records keystrokes like a keylogger software.
Spy software can be used to monitor both PC and laptop/notebook, while Keylogger hardware can only be used on a PC. But spy software only support Windows system, while hardware spy can work fine regardless of operating system at all! That means keylogger hardware can work with Windows/Linux and Unix system.
Spy hardware do not need any CPU resource or RAM to function, while spy software definitely utilize computer CPU/RAM resource, so it might slightly impact the computer speed. Fortunately our spy product only engross very little resource and users can hardly feel it.
Normally spy software need to be installed under a Windows Administrator account to have full permission to function correctly, while keylogger hardware does not need this at all!
In conclusion, both of them have strongpoints and disadvantages simultaneously. You'd better take all things into consideration carefully before making the choice.
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