according to what i found, koreans that came to la, ca. found it easier to get the meat cut across the bones. this is also known as la kalbi. as some went back to korea, they brought this with them and its now popular there also. but the sliced short rib is the original way in korea. again, either way is just fine.
as i mentioned before the three bone style is what i was used to in hawaii. when i first moved to my area, no one knew of it and i had to have the butcher cut that for me $$$$$$$$. as more asians moved in then i started to see it more and more.
spam, can't live without it