I have a 1+ 6. Unlockable bootloader, with NO drama. (And, hence, easily rootable). First phone with dual sim, nice for overseas travel. Great coverage of the LTE bands, pretty much everything other than Verizon, who hates customers anyway.
The only other real candidate for a drama-less unlock is Google (Pixel)... and they don't have expandable storage or removable battery either. Came from a LG G6, with plenty of firmware bugs... never going back to them as they cherry pick what they will let you unlock. If I'm paying for the hardware, it better not be crippled.
I'd rather have the Chinese listen to me [effortlessly] than the rest of the world.