I have both of them. I'm on trial version of KIS v6 and I have subscription for NIS 2007.
Both are good.
I like the Anti-hacker of KIS v6 because it works like Outpost Firewall Pro (where the rule is based on IP address - auto-detected by Outpost and KIS v6).
My only concern with KIS is the CPU usage. KIS slow down my system a lot. I uninstalled it and install in a non-virtual and virtual system but CPU usage of KIS is similar. It's huge IMHO but again, the antivirus and anti-hacker function is nice to use.
Take a look at the screenshots:
NIS CPU usage (while system is idle) : http://www.dozleng.com/images/blog/avp.jpg
KIS CPU usage (while system is idle) : http://www.dozleng.com/images/blog/nis.jpg
I haven't try suite by CA and McAfee. Let's hope someone here will share their thoughts or experience on those and also on NIS and KIS.
Because of the free offers I am trying to decide between the latest versions of Norton's Security Suite, MacAfee, CA and Kaspersky. Does anyone have any opinions on which is better and the pros and cons for each. I am not a novice user, but am not a geek either. I am using a HP zd8000 notebook, running Windows XP Home. Thanks all.