User blog comment:Sport Shouting/Gandalf vs Voldemort/@comment-2016768-20110806210120

Voldemort. The Unforgivable Curses will tear Gandalf apart, plus the fact that he has his soul split with Horcruxes. His cruelty is unrivaled and his quick, decisive strikes will kill Gandalf before the wizard can fight back. The winning factor is Avada Kedavra and Voldemort's usage of that spell only. When all you need is a killing curse, you win.