Are you in USA? Did you check or play with those in store? That could help you a bit to decide in terms or size or weight.
I do not read Manga a lot, but the iPad size is just great for that. Besides is faster and provides color (I know some Manga are just black and white) Some apps like Marvel I think, has a feature that enlarges each scene every time you move forward while reading, so it's even easier to read and enjoy the comics that well.
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