I've read this thread with interest. Having just acquired a 5DS, I'm curious: should I use the a CF or an SD as my primary card? I'm not planning to shoot to both, but to switch to the secondary when the primary is full.
Does it make any difference?
Jeremy
It generally doesn't make a difference. I shoot Nikon, but when I shoot sports and need speed to flush the buffer, I shoot to CF. CF is ultimately more durable as well. If I'm shooting JPG for non critical work I shoot to SD because my laptop has a slot so I don't have to have an adapter with me or putz with it.
The fastest CF is still faster than the fastest SD, so that is really the difference.