The Spring 2017 top smartphone choices for business/enterprise as well as the general public in my opinion are:
|Google Pixel phone||prosumer, management, executive||latest top hardware and OS, instant OS updates but $800+ for useful options|
|Blackberry KEYone||everyone||modern hardware, recent hardened OS, $549|
|Blackberry DTEK60||everyone||modern hardware, recent hardened OS, $649|
|Blackberry DTEK50||budget-conscious||moderate hardware, recent hardened OS, $429|
If one is facing sub-$300 budgets as most of the world is, consider a phone listed on Lineage OS (formerly CyanogenMod). It will take a bit of tech savvy, but you can buy a cheap device used and reflash to Lineage OS with the latest updates. You will need to ensure the device you buy is supported by your carrier, that it has the correct LTE bands.
The Google Pixel phone specs outweigh Blackberry in essentially every way, except for the classic lack of micro SD slot in the Pixel phone. The granular app permissions of Android >= 6.0 make the DTEK app mostly a permission use logger.
Having Android security updates before anyone else, sometimes even including Nexus/Pixel is a very important reason to use Blackberry (unlocked, not through carrier) over typical carrier handsets that might never get updates in an age of zero-day attacks. Blackberry’s deep EMM experience leads to custom security enhancements to the Android system not available on other handsets. Blackberry’s mid-priced handsets present an excellent alternative to Google Pixel handsets, having hardened security at widely-affordable, competitive prices.
SilentCircle: Blackphone 2 has mid-2015, dated hardware.
HP Elite x3: $649, Windows OS
Discontinued Blackberry Android hardware
|Blackberry Priv||physical keyboard||2015 top hardware, recent hardened OS, $500|