Earth said:
None.
Internet Suites are over-rated. No one ever uses them to their full potential.
+1 biozfear
Earth does have a point. Even us as more advanced users don't use the suite to its full potential (well I speak for myself at least).
If we are to analyse all 3 suits:
Avast:
+: Decent Engine, easy interface, low on resources and rarely any slowdowns during scans.
-: Firewall and Anti-spam to be desired.
Kaspersky:
+: Good detection, Cleaning, Virtual Keyboard.
-: Issues with Safe Run for websites on 64bit OS, System slow downs when scanning, Scan Speed a bit slow, UI not that user friendly the moment you go into options, Firewall is not an easy in any way for the average user and specially for games, can be problematic.
Bitdefender:
+:UI is friendly although colours could be improved (ie like Comodo's skins options), friendly options to tweak the suite, detection rate is decent (during my tests), good privacy control options.
-: Resources usage was high, cleaning wasn't really very successful, Auto-Pilot Setting is something I personally did not like at all (auto pilot is my own opinion though).
Based on all the above, if I am to choose one of the 3, I would rather strip down each one and find alternatives for some of the features (for example, get Avast AV + a decent Firewall etc.
But if I had no choice at all, Avast, but with the - disabled of course.
Thats my opinion tho, don't read it as if it was the bible.