Ask HN: CANBus vs. Ethernet vs. MODBUS

Environment is moderately noisy, think automotive, marine or light industrial. The requirements are that you need to potentially send the same message to more then one end point. 80% (by volume) of messages are relatively small in nature, say < 100 bytes, a few (< 10%) are as much as 1k in size.

Then say as an option you wanted to add reasonable quality video and still images to the same network occasionally.

Which topology, physical and protocol infrastructure would you think makes the most sense? The field is green so no predisposed environment is defined and it is open to definition.

Appreciate any feedback/input.