Why choose over BMCC? To avoid costs of SSDs, graphic cards for post, rig, monitor, audio xlr rig, and HUGE storge costs. The BMCC has ver very limited low light and is not suited for event or doc work, and that is according to them.
Also, the C100 has XLRs I handle, allowing for a much more compact setup than a c300. Have to see of color banding is an issue with the AVCHD codec.