This just sounds like you haven't read as many western comics... Nothing wrong with that but don't let the fact you've read more manga than western work convince you that western stuff is more "same-y"... I think they have different panelling styles because manga reads in a different direction, mostly.
No point in generalising so much in either direction though - both western and asian comics have a ton of variety available. There are tons of manga that have boring composition, too - I grew up reading a variety of both good and terrible manga, living between the west and the Japanese-colonised Philippines lol.