When comparing GoldenDict vs QTranslate, the Slant community recommends GoldenDict for most people. In the question“What are the best desktop dictionary (translation + definition lookup) programs? ” GoldenDict is ranked 1st while QTranslate is ranked 2nd. The most important reason people chose GoldenDict is:
Whereas Babylon and ABBYY Lingvo dictionary software support only one (native) format, and Stardict supports only two formats, GoldenDict offers support for many different formats.
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Pros

Pro Supports several popular dictionary file formats
Whereas Babylon and ABBYY Lingvo dictionary software support only one (native) format, and Stardict supports only two formats, GoldenDict offers support for many different formats.

Pro Full-text search in articles
The newest early access builds allow for full text search in articles.

Pro WebKit layout engine allows familiar webpage interface
The program's internal use of the WebKit layout engine allows displaying articles in a format similar to web pages in a web browser
Pro Available also as an Android app
Which can be found here.
Pro Shortcut to lookup words
Select a word and hold CTRL and press C twice and it displays a pop-up showing the definition.
Pro Can be searched with Albert (launcher), via a plugin
Pro Supports 8 different translation services
QTranslate allows the user to select the translation service they would like to use from within the app.

Pro Has full-text translation in contrast to one-word translation of many other contestants
QTranslate offers full sentence or paragraph translation through selecting as many words as one wants.
Pro Supports setting shortcut keys for double-clicks
Such as double-clicking Ctrl , which is very convenient.
Cons

Con No text translation
can only translate single words/short phrases (idioms and such)

Con Windows platform only
QTranslate is not cross-platform, which limits the usefulness of the app for those that use multiple operating systems.
Con Hasn't been updated in years

Con Supports only XDXF format
QTranslate supports only XDXF dictionaries and on-line search.
Although it's not a big problem, as their number is huge.
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