Which of these antivirus software is better?

Only machine can truly be unbiased.

McAfee if you want pc to slowly come to a crawl and miss nasties.

Bitdefender Internet Security 2015 !

I personally use Trend Micro Maximum Security. It costs $44.95 a year, which covers 3 devices. It completely protects my system, has a password manager, and is just rock solid.

Awhile back, I went to a web site that was using Flash to show something. I hate flash because it has so many bugs, but sometimes you go to new sites only to find out they are flash based still. Most of the time, nothing bad happens on a flash site, but every now and then, they will use flash to show ads, and in this case they did that, and the flash ad had a virus attached. Almost the same instant the ad popped up, Trend Micro popped up a box saying it had stopped a virus in its tracks. Two days later it happened again, same site, different virus. Fortunately, Trend Micro logs things like this. I copied the log, send the info to the website admin, and a few days later when I went back to check on something, the flash stuff was gone, and there was no more virus.

Anyways, I fully trust Trend Micro. I have been running it for well over a year now, and fully expect that I will be renewing it for years to come. Like I said at the top, it will cover any 3 devices. I only use it on my PC, but it can cover smart phones, tablets, notebooks and all of those things as well.

Avast is better .

McAfee if you want pc to slowly come to a crawl and miss nasties.

I've spent enough decades bouncing from product to product that when I find a anti-virus that does not drag my system to a crawl, and catches the things that inevitably make their way in every now and then, and does it so fast that the nasty thing never even causes any damage at all, that impresses me.

I like a complete package like Trend Micro. You install it, setup a weekly deep scan, and forget about it for a year. When something gets in, it tells you. Instantly. And by the time it tells you that something bad got in, it is already gone. You look at what it caught, sometimes go read up on what that does just due to curiosity, and move on. No fears that some part of it is still in your system crawling around doing damage.