Hardware advantages say RPG - the best of both worlds-nand memory and micro sdhc. nand for games that give micro sd cards hiccups. Micro sdhc for mega storage. And the ability to copy and paste between them.
Software advantages say CycloDS - Good gui, advanced feature set.
CycloDS is currently a leading card. But the RPG has some things the CycloDS will never be able to have. As far as flash carts go software can be changed, hardware cannot. The RPG could turn out to be the leader of the pack by the next update.
Ah yeah, he kept repeating that "after the way the PS Forums treated me" every once in a while. But again, typical bipolar person behavior. Everyone is to blame but themselves. So it is expected in my opinion.