Switch to 10 inches, best advice I can provide. 6 or 7 its just to small for reading the dialogues.
As far as the eye strain issue, that's more a personal thing. The iPad is not my main reader and I barely read Mangas. On my case, I use my iPad for short reading sessions and find no issues.
The advantage of the iPad is that you will get a bigger screen and there are a lot of nice and free apps for Mangas.
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