I used to use ZoomPlayer Home MAX, but just switched to MPC-HC today. There was only one reason for the switch, but it was a good enough reason to motivate me: custom shader support. It's probably not a concern for most people, but I have a wide-gamut PVA LCD which results in oversaturated reds. Imagine flesh tones looking like they have a lightbulb underneath making it extra glowy (put a torchlight under your hand if you don't get what I mean).
[edit] For a more visual representation, I tried to create two images (from an Index screenshot) that show the difference. Of course I can't do this really accurately since colour representation is slightly different on each monitor, but the relative differences in colour should be pretty obvious.
Without colour correction:

With colour correction:

My colour calibrator finally arrived today, so with the help of
this thread I managed to create a custom shader that pulls video colours back into sRGB space. Sadly, video players do not have colour management support yet, so this is pretty much the only way I can watch my videos with normal colours.
This can be done with a custom filter in ffmpeg too AFAIK, but since I'm using CoreAVC (running on a laptop with IGP so there's no way I can DXVA/vdpau/CUDA) that's not an option for me.
Took some time to set up keyboard shortcuts in MPC-HC, but now I'm quite pleased with it. I still miss some things about Zoom Player though, mainly UI-related changes and features, and certain aspects of presentation (auto-playlist and auto-AR FTW!).
Actually, I don't really care which media players CCCP bundles with it (I wouldn't mind if they removed both either), since I got both Zoom Player and MPC-HC from other sources.