iostream vs. stdio

so, I've got EXPERT PROGRAMMERS telling me to use printf instead of cout in c++, ok but why? what is the difference (in b4 stream)

>>1
Stroustrup is the biggest troll ever, who the fuck would really think about overloading bitwise operators and saying that it's better learning C++ without any knowledge of C. Listen to people like Paul Graham and The Sussman they know what they are talking about.