Hey guys im planing to buy a note 8 but there are two different chipset models so which model should i buy? and also i heard there is a colour burning issue on note 8 is it happen in both chipset devices or just exynos device.please help me to sort out this problems
Color burning (or screen burn-in) only happens when you run 100% brightness for an extended period of time on a white background. Avoid this and you'll be fine.
Qualcomm is American chipsets. They are locked and are regional models like U, U1, V. They cannot have custom roms at this period of time.
Exynos is the Samsung chipset. It is included in models like F, FD and N. It is unlocked and you are able to flash custom firmware/roms etc such as Lineage, TWRP, Magisk.
tl;dr if you don't know what custom roms are, it doesn't matter.