FWIW I have both MStardict and QStardict installed and I like QStardict more. Here are 2 pros of QStardict:

In QStardict when typing in a word I can press enter to start the lookup process, with MStardict I have to select from the list.

In QStardict I can double-click to highlight a word in the definition then copy and paste into the word lookup box to do another search, with MStardict it's not possible - I would have to manually type in a new word.