When comparing Jsho - Japanese Dictionary vs 新和英大辞典第5版 - Kenkyuusha's New Japanese-English Dictionary, 5th Ed, the Slant community recommends 新和英大辞典第5版 - Kenkyuusha's New Japanese-English Dictionary, 5th Ed for most people. In the question“What are the best Japanese/English dictionary mobile apps?” 新和英大辞典第5版 - Kenkyuusha's New Japanese-English Dictionary, 5th Ed is ranked 3rd while Jsho - Japanese Dictionary is ranked 6th. The most important reason people chose 新和英大辞典第5版 - Kenkyuusha's New Japanese-English Dictionary, 5th Ed is:
Most of the options on this page are thin interface skins over the freely available EDICT dictionary provided to the public originally by Jim Breen. (http://www.edrdg.org/jmdict/edict.html) Kenkyuusha's, on the other hand, is a professionally curated dictionary by a major Japanese publisher.
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Pros
Pro Offline use
The entire app is available offline.
Pro Lightweight
37 MB
Pro Significantly higher quality entries than EDICT
Most of the options on this page are thin interface skins over the freely available EDICT dictionary provided to the public originally by Jim Breen. (http://www.edrdg.org/jmdict/edict.html)
Kenkyuusha's, on the other hand, is a professionally curated dictionary by a major Japanese publisher.
Cons
Con Only on Android
Con More limted coverage of manga/slang terms
Although this is is significantly larger and higher quality than EDICT, it will have fewer "slang" terms.