R4 is more popular now.But I still don't have one.Because my old DDTS and DSTwo are still in need.Will try to use R4i SDHC soon
My first card was a Max Media Dock [Compact Flash Edition] Slot-2 Device, worked great for a LONG time, Gave it to a friend who got a DSlite [he doesnt play many games on his DS but the game he does play work great on this old thing lol] My current card is an AK2i I've only ever owned the two of them, and I can vouch that both are rather reliable.