The SM-G9600 variant (Snapdragon 845) is slightly easier. It uses a leaked system.
Unlocking a Snapdragon Samsung Galaxy S9 is not for the faint of heart. It is not as simple as the "one-click" methods found on Pixel or OnePlus devices. It requires patience, financial investment for software tokens, and a willingness to void your warranty permanently. unlock bootloader samsung s9 snapdragon high quality
Old Android 8.0 bootloader v1/v2 allowed a root method via modified Odin. The SM-G9600 variant (Snapdragon 845) is slightly easier