For me, MX Player is the best video player for mobile. I do not use any other video player app except MX.
Initially I have used many other mobile video player app like VLC for android, KM player, HD video player and many more. And I have reached to the conclusion that all these lacks one or other features while MX player provide many features which the above mentioned app lacks.
In MX player I can change the decoder, If one video is made with two language, in mx I can switch the language I prefer. Many video player do not have this features.
MX player also can be used as mp3 player too.
All thesr features and many more make MX player the best video player for mobile.
And I love it. I supports any video.