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新和英大辞典第5版 - Kenkyuusha's New Japanese-English Dictionary, 5th Ed
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The mother of all Japanese-English dictionaries. The full professionally curated "Green Goddess" in electronic form.
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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.
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.
Con That price
Commonly Compared
新和英大辞典第5版 - Kenkyuusha's New Japanese-English Dictionary, 5th Ed
vs