with memory stick you have to flip a switch to utilize the 512mgs b/c only 256mg each side. with memory stick pro there is 512mgs on one side and flipping of a swich. if you go with the 512 stick you would want the pro IMO.
What I understand the difference. That the pro has little better quility in the photo and speed. I feel you are not gaining not much.
SanDisk Memory Stick PRO
---Advanced format increases speed and capacity, integrating real-time recording and data security.
----Capture and playback DVD-quality video in real-time
----Stores CD-quality music and high-resolution digital images
Sony Memory Stick
-----Ideal for recording, transferring and sharing digital photos and home videos, music, voice memos and data.
----4-pin parallel interface for fast read speed
-----MagicGate copyright protection technology provides secure transfer and -playback of copyrighted content such as digital music, video and games
-----Works with Memory Stick-compatible audio/video, photo and computer devices