They didn't choose
Gandalf, like all the five wizards of Middle-earth, was a Maia, an angelic spirit of the same order as Sauron.
Both Morgoth and Sauron managed to inflict significant damage upon the world and their enemies before their downfall, but Morgoth was undoubtedly the more powerful of the two.
No, though she is able to contend with and resist Sauron, for as long as he does not hold the One Ring upon his finger. Galadriel is exceptionally gifted, even amongst the greatest of the Eldar, this was known as soon as she was born, for her appearance looked as if she had absorbed the splendour of Valinor.
Morgoth Was Originally More Powerful Than Sauron
In the depths of time, Eru Ilúvatar created Arda and the Valar. He made the Valar to help create and order the world, but the most powerful Valar, Melkor, turned out to be nothing but problems.
It begins after Sauron's master, the evil lord Morgoth, is defeated. Sauron may have gone into hiding, but he's still alive: the series will eventually show Sauron's creation of the titular rings of power—including the one ring to rule them all.
In The Lord of the Rings, it is said that had Galadriel chosen to use her powers for evil instead of good, she would have been even more destructive and terrifying than Sauron himself. Galadriel was the greatest and most powerful of all Elves in Middle Earth in the Third Age.
Sauron's deepest fear was that Aragorn would use the Ring against him. With its powers of domination, Aragorn could comfortably take over the entirety of Sauron's dark army. Though this would eventually corrupt Aragorn, it would allow him to destroy Sauron and take his place.
Sauron Feared Galadriel
Tolkien also stated that Sauron saw Galadriel as his equal, and therefore, in his rise to power he feared that she would go after that power herself. As we saw in The Fellowship of the Ring, Galadriel told Frodo that the One Ring would consume her and turn her into a Dark Queen.
Galadriel was arrogant and rebellious in her younger years, but she later founded and ruled the kingdom of Lothlórien. She grew to be one of the most powerful Elves in Tolkien's universe thanks to the wisdom she gained throughout her long life.
Eru Ilúvatar
He possesses infinite power and is responsible for the destiny of all beings in the world. In conclusion, Middle-earth is home to a wide variety of powerful and magical beings, each with their own unique abilities and strengths.
His prowess with a bow was unmatched among the Fellowship and, as J.R.R. Tolkien stated himself, Legolas was “endowed with the tremendous vitality of Elvish bodies,” as well as an inability to feel terrible hurts, which made it easy for him to travel long distances over rough terrain in only light shoes.
God is the most powerful entity in Tolkien's Lord of the Rings universe. The Elvish name for him is actually Eru Ilúvatar, meaning “the one, father of all.” So the question becomes: Who is the second-most powerful being? Originally, it was Melkor, “he who arises in might,” the most powerful of the Ainur (or angels).
Gandalf was scared of this beast because he knew how powerful it was since it was a Maia like himself, but it was purely evil.
Is Smaug stronger than Sauron? Sauron would win. One of the main reasons Gandalf wanted Smaug out of the way was that he was afraid of the possibility of Sauron using the dragon in his quest for the domination of Middle-Earth.
While the fight between Vader and Sauron would seem promising, it would ultimately end in Darth Vader's defeat. Though Vader was strong in the ways of the Force and exceedingly handy with a lightsaber, he'd be facing a primordial being whose very powers helped shape the foundation of the world.
In the final battle of the Last Alliance, when Sauron had kills Gil-galad and Elendil, only Isildur and Elrond were close enough to take on Sauron.
She already feels an outcast after Gil-galad tried to send her back to the Undying Lands, and she fears that if she reveals what she has done, it will be the final nail in the coffin. Instead, when Elrond pulls her from the river Glanduin, and she races back inside to Celebrimbor's forge, she chooses to stay silent.
Elrond and Galadriel Go Back a Long Way
Being immortal, all the Elves who play a part in The Lord of the Rings have been around a while by the time the story starts. But even by elven standards, Galadriel is old. She was born in the Undying Lands when the Two Trees still lived.
Melkor is the most powerful of the Valar but he turns to darkness and is renamed Morgoth, the primary antagonist of Arda. All evil in the world of Middle-earth ultimately stems from him. One of the Maiar of Aulë betrays his kind and becomes Morgoth's principal lieutenant and successor, Sauron.
As it turns out, even after forging the One Ring, Sauron was still capable of feeling fear and regret. Actually, even during the War of the Ring and at the height of his power.
Aragorn fears that because of his relation he will follow in the footsteps of Isildur, he will fail to become a great King of Men as was destined and instead lead Gondor and Arnor to their demise.
All other men in the trilogy, even the underestimated and underappreciated Faramir, and his mighty brother Boromir, fall short of Aragorn's heroism. That is why Aragorn is the only one who could challenge Sauron in the Palantir, and win.
Legolas was a nice little Elf princeling yet he was nothing next to the Elven king Gil-Galad. So no, Aragorn and Legolas could not defeat Sauron in hand-to-hand combat.
In the First Age during the War of the Jewels, Dorbon was one of Sauron's strongest servants. He was originally a Maia of Aule, and his name was Maladhros.