Bitdefender Total Security 2013 Vs. Bitdefender Windows 8 Security

Hi,


I have 3 PC's at home: One Windows 7 and two Windows 7.


Should I use Bitdefender Total Security 2013 on all 3? I can buy the product for 3 licenses at lower cost than single PC.


Or should I use Bitdefender Windows 8 Security on the Windows 8 PC's?


Is Bitdefender Windows 8 Security that much better (how?) for Windows 8 systems?


Thanks.


Aloke P.