RE: SAM Systems

The question you pose is very difficult, rather imposible to be answered. Both systems are very efficient, with capabilities many times published, but both (PAC-3 and S-300) still resting in the laurels of their brochures.
The factors that might determine their performance are so many and so complex that any conclusion is foolhardy if you cannot provide exaggerated details about the whole conflict. But then the conclusion will concern only that conflict.

greg