For those who watch a movie on the computer monitor, or even on a 22 "TV, a well-made encode of a movie in 720p is ideal. Often they are no more than 8000 bitrate and its size it is also good to unload, however, those who have monitors with resolutions above 1280 X 720 and prefer to watch movies on full HD 1080p, 1920 X 1080 or 1920 X 1200 monitors, then download a well-encoded 1080p encoder or create a remux, which is nothing more than extracting all the necessary content from blu-ray and placing in a single video file in .mkv, with the original Steam of the video, without losing the original quality, audio format chosen by the user and also the caption.
A 45gb blu-ray, often has lots of extras, deleted scenes, comments and documentaries about the movie, things that most of the time we have no interest in and it is possible to delete them and keep the same quality of the film. With a REMUX you can reduce to 60% , not always the Blu-ray size, from 45GB to 18GB for example.
blu-rays need drivers and specific programs to be run, and REMUX can be run on any media player or HTPC (Home Theater Personal Computer) without problems.
For those who like to have the complete menu to choose the audio options and subtitles, with the animations and extra contents, with REMUX all this disappears, unless they want to do a REMUX also the extra content.