My feedback would be that that is a very strange topic. It's like asking what is the advantage of salt versus sugar!
AC and DC have different uses for different purposes. If you need a steady magnetic field, you use DC and not AC. If you want to transmit power, you use AC rather than DC. If you want to induce current in a transformer, you often use AC rather than DC, etc... etc... Different things for different purposes! You can't just say "I am going to use DC ONLY and that's that!" You won't be able to do many many other things. The same goes for AC.
Like I said, this is like arguing salt versus sugar. A VERY strange debate topic. You can tell that to whoever suggested it.
Zz.