jbrand wrote in post #11932425
Are one of these better/faster/more rugged/etc from a technical point of view, or is this just more of a legacy question?
A CF card, being bigger, can fit more memory in it, meaning both larger capacity and faster speeds (through parallelism). For as long as I can remember, the highest-end CF cards have always been larger and faster than the highest-end SD cards. I could also imagine they could be made more rugged, since there is room for cushioning between the actual memory and the case, whereas an SD card is far thinner. In terms of reliability, CF card readers have pins that can be bent, whereas SD card readers don't. Also note that CF cards do not have a write-protect tab like SD cards do.
I've used CF cards for thirteen years now and SD cards for three, inserted and ejected them from slots hundreds of times, dropped them all on many occasions, and haven't had any problems with reliability or durability.