I think a better approach is to define exactly what you intend to do with it then it will be easier to make a decision. The camera(s) that will be carried, any peripheral gear such as OSD boards, Video downlink TX, number of batteries, etc. all add to the ready to fly weight and take up limited real estate on the frame. Where you think it will be flying most of the the time will factor into the decision as well, if 90% of the time it will be used in close quarters you probably don't want a Cinestar frame or even an octo for that matter.
I own a couple of MK frames and for a basic setup they work well but are not the strongest or least flexible though they are light. For moderate use with lighter cameras it could be a low cost alternative that fits the job. I have a Droidworx AD6 heavy lift frame and it is far stronger than anything I've seen from MK, if the intent is to carry any of the more popular DSLR cameras or lighter weight video cams then this would be a good choice. You can custom build to a degree by adding longer arms and mounts for larger motors plus it will carry pretty much any camera gimbal you would want to use. If there's any one area that I would say would be a minus for the Droidworx AD series it would be in the camera platform vibration isolation, it's much better than the Mk frames but not as good as the system the Cinestar uses. If professional level APV is a requirement 100% of the time then it makes sense to look at frames that are capable of lifting professional grade equipment like a RED and those are limited to the Cinestar and Droidworx Skyjib.
Ken
