the best version of bitdefender which i used was 2011,they had everything right for them,much more configurable,firewall options easy to find and the network monitor at the bottom,i know a lot of people who miss those things.
kaspersky is definitely the most robust of all these three ,has the most features i quite like the banner blocker feature and the safe run ... i am talking specifically about Internet security suites.But it is temperamental has random memory spikes and is not very light.
Eset on the other hand is very light,as proven by av-comparatives lightest after WSA which is completely cloud based but the firewall and hips are difficult to configure.
I personally prefer eset because it has high detection rates not the best but quite good none the less.