One of the selling points of iOS is that its more restrictive nature makes it more secure. But even though it's easier for users to accidentally install malicious apps on Android, data collected by Google (PDF) indicates that less than one percent of Android users have actually done so. Quoting: "During October 2014, the lowest level of device hygiene was 99.5% and the highest level was 99.65%, so less than 0.5% of devices had a Potentially Harmful Application (PHA) installed (excluding non-malicious Rooting apps). During that same time period, approximately 0.25% of devices had a non-malicious Rooting application installed. ... Worldwide, excluding non-malicious Rooting applications, PHAs are installed on less than 0.1% of devices that install applications only from Google Play. Non-rooting PHAs are installed on approximately 0.7% of devices that are configured to permit installation from outside of Google Play. Additionally, the second graph shows devices with any PHA (including Rooting applications). Rooting applications are installed on about 0.5% of devices that allow sideloading of applications from outside of Google Play."
http://mobile.slashdot.org/story/15/...y-harmful-apps