Dumbledore may have been a legendary wizard, but he can't be compared to, well, Merlin, a wizard so legendary even Muggles know of his exploits. Merlin was the world's most famous wizard, and, arguably, the world's most powerful.
He also divided his soul into seven Horcruxes to make himself immortal. Albus Percival Wulfric Brian Dumbledore was the only wizard Voldemort ever feared and the only one who could have defeated him in a duel. Albus Dumbledore is the most powerful wizard in the Harry Potter.
Even when battling Voldemort, in Harry Potter and the Order of the Phoenix, Dumbledore never uses lethal magic. In the duel, Dumbledore is definitely on par with Voldemort, and Voldemort is seen to be annoyed that he can't overpower Dumbledore.
While Dumbledore is a powerful wizard, Gandalf's innate magical abilities and experience in leadership and diplomacy give him an edge in a battle between the two. While the outcome of a battle between the two would depend on the circumstances, Gandalf would win more often than not.
No ,Harry was not powerful than Dumbledore. Dumbledore had single-handedly defeated Grindelwald,the dark Lord of their days, while Grindelwald had the Elder wand. This shows that Dumbledore is powerful.
Hermione could beat Dumbledore any day if she wanted to. She's one of the most brilliant minds of her generation; like any good Gryffindor, she's brave, loyal, and strong. She mastered advanced spells at a young age, could make any potion perfectly, and her quick thinking saved her, Ron, and Harry more than once.
Without a doubt, the most powerful wizard in Middle-earth is Gandalf the White. While Gandalf was always a reasonably powerful wizard in his own right, facing off against the Balrog in the Mines of Moria, a battle that took ten days and resulted in the mutual demise of Gandalf and the Balrog.
Albus Dumbledore is the most obvious person who can defeat Voldemort, outside of the Salazar Slytherin vs Voldemort debate, and the Dark Lord seemed to realize it. Rowling herself has explicitly stated in the books that Dumbledore is the only person Voldemort fears and recognizes as a genuine threat to his own power.
If Thanos didn't have the Infinity Gauntlet then Dumbledore could fairly easily defeat him with a spell like Stupefy which would leave him stunned.
His exceptional magical abilities, immense knowledge of various branches of magic, and strategic thinking make him a formidable wizard. Dumbledore served as the Headmaster of Hogwarts School of Witchcraft and Wizardry, was a highly skilled duelist, and possessed incredible wisdom and intuition.
Godric Gryffindor, the founder of Gryffindor house, was one of the most powerful wizards of his age, so powerful that he was said to be the greatest duelist of that era. Always ready for battle, Godric wouldn't just use a simple wand, he'd also wield a mighty sword.
DUMBLEDORE WAS A BETTER CHARACTER: He Was More Powerful
Throughout the entire franchise, we wanted to see just what Dumbledore was capable of, and boy did he show it... eventually. Snape, while great at making potions, just couldn't compete with Dumbledore in a physical sense, so he loses out on this one.
1 Voldemort – Harry Potter
He who should not be named makes the number one spot. Voldemort is known for his viciously evil nature. He has wiped out entire generations of Wizards for standing against him, and his power in the dark arts knows no equal.
House-elves could perform magic beyond that of a wizard
Dobby frequently demonstrated himself to be immensely powerful, causing Lucius Malfoy himself to back down with just a point of his finger.
Grindelwald Is More Powerful and Cunning Than Voldemort
No one could possibly trick him in his mind, and of course, this leads to his undoing as Harry defeats him and reduces the wizard to nothing but ash. Grindelwald had more power in the Wizarding World up till the final moments of his life.
Verdict: Snape Is the Stronger Wizard
McGonagall is surprisingly skilled in the Dark Arts but not on the same level as Snape. She's also most likely incapable of casting the Killing Curse, which puts her at a disadvantage.
The Blue Wizards Arrived First
The first Istari sent to Middle-earth to fight against Sauron are the two blue wizards named Alatar and Pallando. Alatar had been chosen by the Valar Orome, the hunter.
The Season 1 finale of The Lord of the Rings: The Rings of Power resolves many of the series' biggest mysteries. The episode finally confirms that The Stranger (Daniel Weyman) isn't Sauron in disguise but is, instead, an Istar — a.k.a. Wizard — sent to Middle-earth via an otherworldly meteor strike.
Why was Saruman jealous of Gandalf? As far as I can tell, at least before his fall, he was more powerful than Gandalf in every way. You are correct in your assessment that prior to his fall, Saruman was more powerful in every way. However powerful and wise he was, what he was not is loved.
Epilogue. After the war ended, McGonagall was fully instated as the Headmistress of Hogwarts and was awarded the Order of Merlin, First Class by new Minister for Magic Kingsley Shacklebolt.
At the end of the series, Dumbledore admits to Harry that power is his ultimate weakness. He was always conscious of it, and he feared that power had the potential to corrupt him beyond help. That's why he never accepted the Ministry of Magic position even after it was offered several times.
In close-quarters combat, Gandalf easily has an upper hand because of the weapon he wields. Glamdring, the Elven blade he uses, would put Dumbledore in a spot of trouble. He'd need to maintain his distance at almost all times during this battle, while Gandalf would be comfortable fighting at both short and long ranges.