AVG Vs Avira (which is best)

I use to have AVG and it worked pretty well for me, until I got a virus that it did not detect. One day I was on my computer and I noticed that my computer was running terrible. I ran the AVG scan and nothing came up. I decided to go on the free windows live one care site and do the free scan with them. It showed I had viruses. I knew a few other people who had Avira and I decided to try it. I uninstalled AVG and installed Avira. I ran the Avira scan and it picked up the virus. I have had Avira now for years and love it. You should never have to pay for virus software. There is a lot of free virus software out there. In my opinion, the best is Avira. Be careful with AVG, some viruses might get through and it will not detect them.