As long as the bootloader can be unlocked, it'll be easy to root the phone. (It'll be easier if custome recovery already available for your phone lah.) That means Huawei and OPPO are out because they don't allow you to unlock your bootloader. I believe Samsung phones will trip KNOX so you'll lose Samsung Pay and secure folder. Pixel, OnePlus, Xiaomi, ASUS have unlockable bootloaders, so they're your best bet. I dunno about LG, Motorola and HTC.
Xiaomi cannot unlocked now, only some specific models still can
Xiaomi cannot unlocked now, only some specific models still can
As long as the bootloader can be unlocked, it'll be easy to root the phone. (It'll be easier if custome recovery already available for your phone lah.) That means Huawei and OPPO are out because they don't allow you to unlock your bootloader. I believe Samsung phones will trip KNOX so you'll lose Samsung Pay and secure folder. Pixel, OnePlus, Xiaomi, ASUS have unlockable bootloaders, so they're your best bet. I dunno about LG, Motorola and HTC.
Nova 3i can
http://kasiamobile.com/huawei/Where can I buy it