Depends on your use, watching? editing?.
VLC is very popular but for watching lectures I prefer Gom player.
Just because speed watching lectures is easy, and varying the speed and jumping back if you miss something, is all very easy from the keyboard keys.
The x and c keys for speeding up and slowing down. Arrow keys for jumping back or forward.
The speed up/down increments are a lot finer than when I last used VLC.
Not many people seem to use GOM player, but I think it is great! GOMlab.com
I'm using since about 20 years: JetAudio
Its an audio and video player, also available as free version ("Jetaudio basic").
"Jetaudio.com" is also offering a "pure" (free) video-player: it's called "JetVideo" ( JetAudio)
It has a reduced functionality: only "JetAudio VX plus" has all audio/video playback features.
Main reasons for this player are this soundeffects (see link: JetAudio ):
Various sound effects
Enjoy the various sound effects during digital audio/video, Video-CD and DVD playback.
Supported sound effects are Reverb, Wide, X-Bass, Flange, Reverse Flange, Robot, and much more!
Reverb makes you feel like you are listening to a sound in a wide hall or Stadium.
Wide provides a broad (spread-out) sound as if the two speakers are set far away from each other, and X-Bass provides deeper, tighter bass sound.
Try other special effects also!
JetAudio 6 provides new sound effects powered by BBE *.
BBE MP improves brilliance and clarity of music, and BBE ViVA creates an authentic and exciting 3D sound effect from stereo speakers.
Some new GPUs have HEVC decoding implemented in hardware so playing videos will run smoothly with them. As HEVC uses hardest compression algorithms nowadays the main job for playing those videos falls to CPU and GPU s job.
I found Potplayer is able to play Bluray 720p HEVC videos without a lag on my laptop while MPC and GOM struggles
It is a personal choice depending upon the usage charts. For me:
1) It should not lag. Number of CPU cycles or strained GPU
2)Should be able to play common formats extensively.
4) A good range of fine tune audio/video/de-noise settings.
6) added bonus - editing,recording or some neat feature