Just a quick question.. Is Avast better than larger Antivirus providers like Norton and McAfee? 
A quick and clear

answer from my point of view:
It depends.
For me, the choice is very easy.
I have a three year free subscipton on Norman antivirus delivered with my PC,
but I prefer Avast.
But I assume this forum is not the right place to get an objective answer to your question. That said, this forum is a strength that Avast has.

Not many AV's, if any, has such a forum.
Good luck in your choice.

HL