I would STRONGLY suggest using neither product. Instead, you will have great security and performance from your new cable connection with the following:
1. AVG Antivirus (
http://free.grisoft.com
2. Browse exclusively with Mozilla Firefox (
www.firefox.com)
3. Use an inexpensive router to connect between your cable modem and your computer
4. Enable the Windows Firewall
5. Periodically run an anti-spyware scan if you tend to hit porn, gambling, MySpace, or free ring tones/screensavers sites).
Good luck and welcome to high speed!