cyma's shoot a little harder stock, but are hit-or-miss on quality control.
the dboys/kalash are really reliable and tough... but perform worse than the good end of the cyma line... but are consistent throughout the line and you're a lot less likely to get a lemon.
They're more or less the same, just cyma goes for higher performance using almost the same parts, and doesn't hit their mark every time while dboys goes for getting a decent gun out every time as far as I can tell.
