There is no difference other than the processor. It doesn't affect root differently. The only reason to decide on Snapdragon or Exynos is based on the processor performance. Check out some YouTube videos like this one:
You can also pay $125-$135 to have the bootloader unlocked on the U.S. Snapdragon variant if you live in the U.S. and that is worth it to you. It generally takes a few days to around a week to get the bootloader unlocked that way.