When comparing imiwa? vs 新和英大辞典第5版 - Kenkyuusha's New Japanese-English Dictionary, 5th Ed, the Slant community recommends imiwa? for most people. In the question“What are the best Japanese/English dictionary mobile apps?” imiwa? is ranked 1st while 新和英大辞典第5版 - Kenkyuusha's New Japanese-English Dictionary, 5th Ed is ranked 3rd. The most important reason people chose imiwa? is:
Lookup by Japanese kanji, Japanese hiragana/katakana, or English alphabetic romaji
Ranked in these QuestionsQuestion Ranking
Pros
Pro Ease of Vocabulary Lookup
Lookup by Japanese kanji, Japanese hiragana/katakana, or English alphabetic romaji
Pro Offline Use
The entire app is available offline so no internet connection is needs, which is good for when using a device that does not always have a data connection.
Pro Large library of example sentences
Allows users to lookup the dozens of example sentences for each word, providing context to dictionary definitions.
Pro Conjugations
User can lookup conjugations for verbs
Pro Extensive Kanji resources
Organizes kanji by JLPT, jouyou Kanji list, and SKIP
Pro Free
All features are free, no in-app purchases necessary
Pro Sentence Analysis
Automatically inputs pasted sentence on application launch, and breaks down the sentence word by word.
Pro Multilingual Support
Definitions are available in English, French, German, Italian, Korean, Portuguese, Russian, and Spanish
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 Large Size
Since the app can be used entirely offline, there's a large size, 323 MB
Con Only on iOS
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.