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
What is the best antivirus for Android and IOS?
360 Security ESET Mobile Security & AntivirusAvira Antivirus SecurityAVL
These days Android security plays a vital role. So having best android security apps will protect your smartphone from malware attacks.
Avast Mobile SecurityThis is a free app and consists so many features. Those are virus scanner, virus removal, call blocker, network meter, app manager and a firewall. If you pay some premium then you will get the app-locking feature. This will helps you to give a PIN to your private apps. Nobody will open those apps without entering the pin which you have given.
AVLThis is one of the former AV-Test award winners. It is not only to protect the android database and also do scanning to protect your mobile from any viruses. This AVL having other fantastic features those are call blocker and anti-phishing. Call blocker prevents unwanted numbers from contacting you and anti-phishing stop harmful websites loading. If you are struggling with battery life then this app will help you.