Do you hve to have a samgsung drive, there are pretty good non samgsung options.
Don't relly worry bout tbw, it won't be a issue on a boot/game drive.
Id probalby get a drive like a sn550 or 660p/p1 here.
It does make a difference if you ever need to copy between drives or extract large archives, the 660p throttles down once the buffer fills up due to slower NAND when writing. But like you said, if its just OS and downloading games you wont notice a difference.