Not sure about the best, but I recommend trying Avast.
360 Security ESET Mobile Security & AntivirusAvira Antivirus SecurityAVL
I know Avast and Avira are good ones but Norton is a clunker. Take a look at this list.
10 Best Security Antivirus Apps for Android & iPhone - DesignBo
When I worked as an online Tech for a while, I encountered all of these questions at one time or another.
10 Common Tech Questions (and Their High Tech Explanations)
How to solve the 10 most common tech support problems yourself ...
Linux, the most effective proven, updated really often.
Avg free. But used Kaspersky.
since i started using chromebooks a few years ago, i haven't used Antivirus since but if i did have to pick one, it would be Microsoft's Windows Defender and Malwarebytes along side.
There are a few sites with ideas for that. I'll list two for you.
5 Easy Ways to Improve the SEO of a blog & Boost Traffic ...
I use AVG Free mostly with Malwarebytes also. I also run Hitman Pro as it's the best second opinion cleaner.