JDM ECU and Greddy E-manage

I have the US ecu and im going to be getting the Greddy E-manage. Is it better if I get the JDM or just use the one i got. It is a piggy back, and the JDM one has better spec already. just want to know which would be better or if the JDM one even works. thanks

On the note of the JDM ecu. I would only concider using it if it was damn cheap. All it is going to do is give you a slightly higher baseline. You modifying the ecu signal anyway. So you may not notice a difference once you tune the engine.

There was a post on the mr2 oc board about using the ecu w/o any tuning making more power when adding a turbo or fuel, but you are tuning it and should end up with a close enough signal anyway. I think it would be a waste of money.

thanks