The Sage supports the Kobo stylus, the Forma does not. Last time I used a Kobo (a couple years ago) they didn't have a built-in Japanese to English dictionary, just Japanese to Japanese and English to Japanese. You can add custom dictionaries with some effort. Japanese word lookup also wasn't the best as it would usually just select a single character rather than the word and couldn't deconjugate even when the whole thing was selected.
Although when reading manga you can't do dictionary lookup on words anyways because they're just images. You can manually lookup words but that's a bit of PITA. I would just keep a denshi jisho on the side.
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