Plz let me know about memory stick pro,memory stick duo pro.which is best for digital camera?

It depends on your camera.

Newer Sony cameras ONLY take Pro Duo. The MS Pro will NOT work.

Older Sony cameras take the larger Memory Stick Pro (or the Pro Duo with the adapter).

If you don't have a Sony, a MS Pro or Pro Duo will not work.

If you have doubts, go into any Best Buy/Circuit City and ask them which memory stick/card you need for your camera. Or post what camera you have and we can tell you which one you need!