George R.R. Martin Says Gandalf Would Beat Dumbledore In A Fight - What Do You Think?
Who Is The More Powerful Wizard Gandalf Or Dumbledore?
It's a subject that's been on fantasy enthusiasts' minds for years, and George R.R. Martin has finally answered it.
Most people seem to believe that Gandalfwould win the fight, and I believe this is simply because he has been around longer as a figure. It's more respectable to suggest that Gandalf is more powerful than Google because he wasn't created in the same year. Tom Sawyer would kill Batman without breaking a sweat for the same reason. and so on.

Now, I'm going to seem like an idiot and jerk because I haven't read the Lord of the Rings novels, but Dumbledore appears to be a stronger magician than Gandalf.
According to the movies, Gandalf's power reaches its pinnacle when he transforms his staff into a glorified torch. It looks cool, and he's quite skilled with a sword, but look at Albus...
George R.R. Martin, on the other hand, believes I'm mistaken and believes Gandalf will triumph in a combat between the two.
Meanwhile, Gandalf seemed to be mostly concerned with the lighting and the cracking of a few pebbles. I get that he's more than that, but building a boat out of pipe smoke doesn't appeal to me.

Does George R.R. Martin Like The Lord Of The Rings?
It looks like he like the 'Lord of the Rings' more than 'Harry Potter' or he is just a big fan of Gandalf than Dumbledore.
It can be seen from his statement while talking to Lily Collins.
Lily Collins stated Harry Potter was her favorite book series after seeing Tolkien, the biopic about the Lord of the Rings inventor, according to Variety. George R.R. Martin, on the other hand, interrupted her and exclaimed:
“Gandalf could kick Dumbledore’s ass.”
Is there any subtext at all? He made his point and then walked away. That's all right, George. That's all right.

Gandalf vs Dumbledore. Epic Rap Battles of History
However, Warner Bros. owns the rights to both characters, so they could make a film in which they fight (though they won't and shouldn't).
To be honest, I wouldn't be surprised if JK Rowling emerged from her cave and claimed that Harry Potter and Lord of the Rings are set in the same universe and that Sauron was a renegade Death Eater who stole one of the Horcruxes (The One Ring). That appears to be her personal style.
Conclusion
In a fight between Albus and Mithrandir, I'd guess Albus would win. Even if he was eventually assassinated by a 50-year-old goth. I understand that Gandalf is essentially an angel, but Dumbledore has a Death-made wand that he actually uses.
Matilda, on the other hand, would kill them both without blinking.