When comparing IMDB vs Trakt, the Slant community recommends IMDB for most people. In the question“What are the best movie recommendation websites?” IMDB is ranked 1st while Trakt is ranked 2nd.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Best selection of movies on the web
Pro They have all the movies ever made
Pro Clean user interface and easy to navigate
Pro Multi-platform support
The Trakt.tv API powers hundreds of apps on all the popular platforms like Kodi, Plex, MediaPortal, VLC, iOS, Android, Apple TV, Apple Watch, and more.
Pro Auto scrobbling
It integrates with your media center or home theater PC to enable scrobbling, so everything is automatic.
Pro Recommendation engine
Based on your favorites, trakt recommends additional shows and movies you'll enjoy
Cons
Con NOT a movie recommendation engine
Con Generalised ratings
Con Fake ratings
Some ratings are fake since the site applies what they call weighted average ratings instead of actual ratings.
Con Not great support for non-english shows
Will only show content that has english titles. So even though the show you are looking for can have all the metadata with name, posters descriptions etc on "source" portals it will not appear on trakt unless it has english metadata to come with it.
Con Adding new shows/movies can be proven tricky
In order to add new shows you often need to jump through hoops via different sites (which differ for movies and tv shows).
The shows MUST have english title to be added at all.