Avast :
Cloud protections
Better detection on 0day samples and never seen samples.
pretty light
Good forum support
Only improvements on each versions ...
brand new powerfull technologies (https://blog.avast.com/2012/12/03/new-toy-research-lab/).
The good forum support on avast is rather debatable. From what I can see, its nearly 70% of posts not fully addressed while some are attempted to be assisted by normal members which sadly to say, do not have a clue.