Emsisoft More Better
Based on what?
Detection rate? Please take a look at ''virus exchange'' section and see who's doing better.
Light on the system? Just take a look to your windows boot time, and memory usage
Behavior Blocker? Emsisoft's is really good but it takes time to react, Qihoo's on the other hand (because of the cloud) reacts more faster.
The ONLY thing that Emsisoft is better is the webblocker.
Additional:
Does Emsisoft provide any webcam protection?
I am really sorry for the off topic answer, but i dont feel comfortable reading answers like ''this is the best'' without say why.
I always be careful with answers because there are some users depends on this kind of discussions to choose what is the best and what is not for them.