When comparing MovieLens vs Letterboxd, the Slant community recommends MovieLens for most people. In the question“What are the best movie recommendation websites?” MovieLens is ranked 6th while Letterboxd is ranked 8th. The most important reason people chose MovieLens is:
MovieLens is run by a research lab at the University of Minnesota. The entire service is provided free-of-charge and without advertisements or sponsors.
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Pros
Pro Non-commercial
MovieLens is run by a research lab at the University of Minnesota. The entire service is provided free-of-charge and without advertisements or sponsors.
Pro Personalized recommendations
Rather than provide generic recommendations based on popularity, MovieLens generates personalized recommendations based on individual preferences.
Pro Community tagging
An open tagging system helps to further categorize movies.
Pro Built-in wishlist
All movie listings include a handy add-to-wishlist option, making it easy to save titles of interest.
Pro Excellent to read others' reviews of movies & to locate movies from same director that you might watch next
There are lots of user determined "lists" of movies.
Pro Log and review movies to watch
Can be a good reminder not to start watching a movie you've seen before.
Pro You can share your favorite films with friends
Letterboxd works like a social network for movie lovers. You can follow others to discover new interesting films as well as share the flicks you liked with others.
Cons
Con Hard to locate where you can actually watch the movie
Not so easy to find where to watch a movie of choice as there are now so many different streaming services and one rarely subscribes to watch a single movie.