Sorry I tried my best to make it look simple 
I think the plus side is that you can rearrange the areas much more simply and into squares easily.
While you have to make sure in the Japanese rules case that every stone on the board stays on the board, which can make some things a bit more awkward to rearrange without being practiced in it.
I’ve had some awkward times trying to score boards with Japanese counting, making 5s and 10s and so on. It feels a bit weird moving around opponents stones for instance even though it wouldn’t change the score if you do it right.
If only all games looked like
