Very slow to load the video compared to Zplayer 1.2 so I don't really know if the video is beginning or not, but it s quite fast to go fast or rewind.
I don't know what to do when I want to stop the video
Well it s not very good , Launching the videos is too odd...
EDIT : You have to push a long time ( around 2 seconds and release and the video begins)
I did some test : FLV / AVI vidéo work badly in Mplayer and not on Zmplayer
WMV , doesn't work on both except for the sound
MP4 work on both and perfectly , sound is good

AVI work but the frames are slow , I don't know why but we can't see subtitles in ZMplayer. And there is no external file , only one video ...
3GP works on both but have no sound
and Mov don't work properly , video is very very very slow and sound always jump every second.
My conclusion is they are the same except for zMplayer who cannot read subtitles on a video I don't know why , maybe there was a zoom I didn't see.
But Zmplayer is much more easy to use and fast.
It was my little review , I hope it ll help. But the thing to remermber is Ming like MP4 files