Personally, I need an app to protect me while i'm browsing, not about new installed or malicious apps because I only use PlayStore and i dont install risky/strange things on my smartphone.
My problem is represented by those damn popup on many mobile version sites, on which I could tap by error and redirect me to scam/porn sites or auto-download risky apps.
I tried many AV apps that claim to support web protection (list you something: CM, avira, webroot, avg, lookout and many others FREE ones) but only AVAST has been the App that protected me this way. So I got it with just web protection, very effective and light as a feather