I Add my 0.50 ctvs on this Secure phones issue. There's
a consensus worldwide that the Cellphone is the most daily
used device. So improve the security features Pays off
Having said that in the "Enterprise field" according with this Tech
article iPhone ranks high-Position itself as the most secure: Learn more
Apple winning the enterprise security race, Samsung makes push | ZDNet
Unfortunately their data was just the perceptions of laymen tech executives who may not understand how the security in each OS actually functions and are incredibly likely to have a bias in favor of their current implementations and the ease of enterprise control over devices within those software packages, as opposed to the general native security of each device. So for IBM as an example, if they are set up with a BYOD policy that requires granting the company device administration rights - they can get that on any device, however they may have software set up internally that makes it really easy to do one a few specific models of devices.
Barring any giant holes in my understanding of the security features of each platform, for which I'd be unaware, Android with Marshmallow and Nougat seems to be very far ahead of Apple unless the user modifies the software and it is just as easy to prevent the user from doing so on Android as it is on iOS. But, because Android has such a commanding lead on marketshare, it is subject to more attempts to distribute malware within the ecosystem. This is the primary reason for monthly security bulletins and that is how the rankings above are actually determined. Any device not providing monthly security updates is inherently less secure than those that are, even if it is only in a theoretical sense such as the last several "major breaking news" type malware scares that were nearly impossible to execute on almost all devices.
This brings up the next issue that Android faces on the security frontier - fragmentation. With monthly security updates being optional and in some cases pushed by OEM's and in others dependent on carriers and with different OEM's shipping less of the security features than possible with each major firmware release, there is still an intrinsic hierarchy of determining which devices make the shortlist.
All devices provided monthly security updates are more safe than their counterparts that are not. Those that are not should not even be considered on the list with the exception of Samsung who gets a slight push into the honorable mentions due to their Knox software, which BlackBerry helped develop. So if and only if monthly updates are happening, this is basically how I view it: