I already have the two cameras, might as well use them. And two cameras will capture twice as much data as one. Doing LRGB with a mono camera would take much longer, and I don't have the spendy filter wheel for my mono camera anyway.
They are old and slow (an Orion SSProv2 and an Apogee U8300) so I don't think the CPU load would be that great. They are also both massive cameras..
My question was really around software. I'm using two short refractors so differential flexure won't be a huge problem. I have been using Nebulosity for ages but I don't know if you can run two instances on one PC (silly me - I can trivially check that).
Maybe time to check out Nina but am not sure if it will support my obsolete cameras.
EDIT: two copies of Nebulosity 4 work just fine, with about 8% CPU utilization.. on my 6-core i5-9600K desktop. I'm planning to buy a cheap obsolete Windows laptop for image capture as the astronomy software situation on MacOS is almost non-existent; Apogee drivers are 32-bit only (no joy for Catalina, and my MBP16 only runs Catalina..) and there's no driver for the unlamented Orion SSProv2.
What’s ‘better’ about the color data from an OSC vice the separate RGB filters from a mono that you would want to go through all that expense and hassle?