When comparing 新和英大辞典第5版 - Kenkyuusha's New Japanese-English Dictionary, 5th Ed vs Jishop, 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 Jishop is ranked 5th. 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 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.
Pro Limited free version available for the most common kanji
The free version shows the 1006 Gakushū kanji. Some versions (desktop and android) give a 30 day full version trial before reverting to the limited version.
Pro Kanji dictionary entries are separated by 'theme'
There is often a slight correlation between pronunciation and shades of meaning for kanji, which most dictionaries don't seem to show you. Jishop will try to tease these connections out, helping to significantly clarify some rather broad kanji.
Pro Different (and better) radical lookup mechanism than the typical radkfile indexes
Most EDICT skins use the radkfile mechanism, which is 1) riddled with errors and 2) rather incomplete. Jishop has its own non-bushu lookup mechanism that is significantly easier to use once you get used to the slightly quirky interface.
Cons
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.