Be careful on the 1D MK IV, SD speeds are indeed hampered by the controller (in the camera). So doesn't matter what card you put in beyond a 20MB/s card, you'll find no difference. Which means if you are writing to both then the SD is a "bottleneck"Greatland said:
Both the MK IV and the 1DX can do UDMA 7 in CF so the latest cards will give you the best performance. Of course this is more in terms of how quick the camera flushes to the memory card. I recently tried a 60MB/s CF vs 30MB/s on the MK IV and was pleasantly surprised by the difference
Finally, you perhaps might want to consider trading off size of memory card vs speed. By this I mean I'm not happy with more than 8GB card for normal (16GB for sports nature) on the basis of how much data I am prepared to lose should a card fail. I've only had 1 CF fail - a transcend, which failed before I used it in anger (failed during soak testing)
Best therefore does depend, as mentioned, on your needs...
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