Gandalf is the best wizard of all time. Waaaay better than Dumbledore. By alot. Dumbledore just dies when he's killed. Gandalf just get stronger and cooler.
Yer, But Dumbledore has so many spells, Gandalf has like, what 5, Light blasty thingy, Wack with staff, Wizard blast, Lightning sword... Thats 4! Dumbledore haaaas -> Expeliarimus, Stupify, Ruducto, need I continue :P