What's advantage of xdpicture card over the older smartmedia card?

[milonelion]

I see that smartmedia cards are cheaper than the new xdpicture cards. For newer cameras like 3 to 5 mp ones, what are the advantages of using xdpicture card instead of smartmedia? Is it only the write/read speed?

 

[Goondu]

If I'm not wrong, SM card is limited to 128MB in size while the xD card memory can be much higher. Also, the size makes the difference.