So what is the difference between an unlocked (Open Sourced) device like the Elephone or One Plus vs a Nexus?
Though the both can be unlocked, rooted, and run custom software, Nexus devices get their software from Google so you are getting the latest from the source where as an unlocked device rely on developers to get the latest software (usually compiled from Google's Open Source). So as long as a developer or the manufacturer supports your device you will get the newest software. The exception is if you are able to compile a ROM from source yourself.
So which device should a person get?
If you love flashing custom ROMS and you do not mind gambling that your device may only be supported by a developer (ie Cyanogen) then you may want to check out some of these devices like the One Plus or the Elephone. For the price and what you are getting specs wise they are a good bargain especially if you just want a device to play with and hack to death without messing up your daily driver.
If you rom every now and then but mainly just root to add a few apps to stock Google then Nexus devices may be for you.
Give some feedback below on what you guys think.