When comparing IINA vs MPC-BE, the Slant community recommends MPC-BE for most people. In the question“What are the best HEVC/H.265-capable media players?” MPC-BE is ranked 3rd while IINA is ranked 6th. The most important reason people chose MPC-BE is:
Seek Bar supports thumbnail preview (like Youtube) and chapters marker.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Like MPV with better GUI and settings
It's like mpv, just more user friendly GUI and more settings available via UI.
Pro Extremely stable
Extremely stable, even while still in the beta.
Pro Support for lots of codecs
Supports lots of video codecs, like mp4, mkv, etc, and lots of audio codecs including opus.
Pro Doesn't black out other displays when going full screen
It can black out other screens if you want, but out of the box it leaves your other displays alone.
Pro Runs on MPV so it's scriptable and runs any MPV script.
More information here.
Tip: if you're doing a lot of cropping and slicing of videos and you thought the new quick tools in Finder / Quicktime Player are a great improvement, try setting up IINA with slicing.lua and some keybindings for navigating your video + setting the slicing positions.
Make sure your ffmpeg command (in slicing.lua) is set to copy the original codecs and that it's using your GPU.
Pro Online subtitle searching and intelligent local subtitle matching
Pro Fully customizable keyboard, mouse, trackpad, and gesture controls
Pro Open source
Pro Powered by FFmpeg
Pro Displays preview thumbnails
Seek Bar supports thumbnail preview (like Youtube) and chapters marker.
Pro Supports madVR external Video renderer
madVR is a high quality video renderer (GPU assisted).
Pro Supports most known audio and video formats
Plays various video and audio files, and also supports H.265 (with small file size installation). The player doesn't use a lot of computer resources.
Pro 32-bit & 64-bit support
Pro Built-in YouTube playback support
Can play YouTube videos out of the box. Just drag and drop the URL to the interface.
Pro Supports multimedia hotkeys
Cons
Con Unstable
May crash unexpectedly, while clicking on something in the subtitles section in the right-hand panel, for example.
Con Blacks out other displays when going full screen
