I'd rather use the free versions of Avast or Avira. Not interested AT ALL with yearly licenses. I'd rather pay $99 for a lifetime license and be done with it. Sure get a deal on it for free or $5, but when the next year comes around I have found it to be hard to find a similar deal. So I end up jumping ship to a competitor or free version. I'm more down for a set it and forget it method as long as the product I'm using is solid.
Yep, Bitdefender does VERY well in testing, consistently the best for the past 2 years or so. Just didn't run very well on my machine, though it works well for others. I'll never knock Bitdefender, just wasn't for me. I also tried Bullguard, which is a company that matched Bitdefender AV, Outpost FW, plus a few other applications in one suite. Again, my performance sucked, but others have had good luck. Oh well.
they're both excellent products - personally, i prefer WSA (webroot) because of its lighter system impact and webroot's better quality of product support, and because of their more progressive, forward-thinking approach to malware remediation. there's a lot of really cool tech under the hood.
based on tons of client installs i've performed in the last couple years, bitdefender tends to have somewhat heavy system impact, can be extremely quirky/crash-happy depending on the system (some folks have no issues, some folks have nothing but issues). however, when it works, it works really well.
personally, on my machines, i'd take WSA over bitdefender every time.