The weakest archangel in Supernatural is generally considered to be Gabriel, the youngest of the four, especially when he's weakened by hiding or having his grace siphoned, but he's still incredibly powerful, capable of taking down powerful demons and even other angels when not depowered, making him deceptively strong despite being the "youngest".
Perfectly said, yes, Gabriel may be the weakest Archangel but compared to monsters and demons he's an absolute god-like force, however, he's not all that impressive when you compare him to the top Archangels Michael and Lucifer.
Michael was an archangel that existed and ruled over the Apocalypse World. He is the most powerful archangel to date. He is an alternate reality version of Michael, where Michael won the apocalypse instead of Lucifer.
As an archangel, Raphael was one of the oldest and most powerful beings in all of existence, possessing an immeasurable amount of supernatural power that made him more powerful than any Ghost, Demon, Angel or nearly anything else in the universe for that matter.
Angels of Hell, Mālik and Zabānīya.
Because they identify Michael with Jesus, he is therefore considered the first and greatest of all God's heavenly sons, God's chief messenger, who takes the lead in vindicating God's sovereignty, sanctifying his name, fighting the wicked forces of Satan and protecting God's covenant people on earth.
Several apocryphal texts name Uriel as an archangel, a high-ranking divine being with superior status to other angels like the Seraphim and Cherubim. Some depictions of him include him in the four archangels charged with watching over the four corners of the world: North, South, East, and West.
However, Uriel proves the stronger combatant and beats Castiel who tells Uriel he can't win as he still serves God. An enraged Uriel beats Castiel down and tells him "there is no will. No wrath.
Background. Gadreel was once God's most trusted angel. He was stationed by God at the Garden to protect it from evil.
When he went into hiding, he traded away some of his grace. In his weakened state, the sons of Loki were able to ward and kidnap him and sell him to Asmodeus. Asmodeus spent a decade siphoning Gabriel's grace from him. That's why he was so weak.
The only one known to surpass God's near-infinite power was Amara, his twin sister. God has been said by Billie to be more powerful than the Shadow, the ruler of the Empty, who in turn is more powerful than Billie, the new incarnation of Death.
Gabriel, also known as Loki (falsely) or The Trickster, was the fourth and youngest of the four archangels created by God. Despite the fact that he is the youngest of the archangels, he is still very powerful. Gabriel was very compassionate towards his family.
Definitely Azazel. Cas couldn't even handle Alastair and he was weaker than Azazel.
Michael was the first and oldest of the four Archangels created by God, making him the very first angel ever created in existence, this includes Archangels of other universes and was as well as one of the oldest and most powerful beings in the universe.
Winged warrior Lysander has been alive for centuries, and yet he's never knowndesire—until he meets Bianka. Spawned from the bloodline of his enemy, the beautiful butdeadly Harpy is determined to lead the untouched Lysander into temptation.
God's Judgment on Lucifer
Lucifer was not satisfied with worshiping God; instead, he wanted to be worshiped. Once a beautiful, powerful angel of God, he lost his former, exalted position in Heaven. “How you are fallen from heaven, O Lucifer, son of the morning!
In the season four premiere "Lazarus Rising", the angel Castiel is introduced as the one who brought Dean back from Hell and resurrected him.
Raphael is more powerful and the better warrior, but the Archangel Blade makes durability an irrelevant advantage. Gabriel's mastery of illusions is such that he can fool Lucifer, who is vastly more powerful than Raphael and far more versed in this field. If Gabe can fool Lucifer 2x, he can definitely fool Raphael.
Lilith is said to be "older and more powerful than Yellow Eyes (Azazel)" and thus holds higher status than Azazel, on which Kripke commented, "You don't get much higher than her until you start digging into Lucifer territory." Knight provided more information on the character's importance in Hell and in the story, ...
The Light, also known as God and by his alias Chuck Shurley, is one of the two overarching antagonists (alongside the Shadow) of the Supernatural franchise. He is the arch-nemesis of Sam and Dean Winchester.
While imprisoning Lucifer, Crowley managed to knock him out with a single punch, although he was controlling Lucifer at the time and has shown to be inferior in strength to high ranking angels like Gadreel who shrugged his punch off with virtually no damage.
After he was killed by the Archangel Raphael, Castiel was resurrected by God and joined Sam, Dean, and Bobby Singer in a quest to prevent the brothers from becoming the vessels of Michael and Lucifer. Castiel would later be killed by Lucifer, but his actions allowed Sam to trap both Archangels away.
Uriel brought Lucifer close to him and with what little strength he had left, whispered in his hear "The piece is here", giving Lucifer a key to discovering that at least one of two remaining pieces of the Flaming Sword were on Earth. Uriel closed his eyes and died in Lucifer's arms.
The Ethiopian Orthodox Tewahedo Church venerates the four archangels Michael, Gabriel, Raphael, and Uriel, as well as: Phanuel, meaning "Face of God" Raguel, meaning "Friend of God"
Uriel is often identified as a cherub and the angel of repentance. He "stands at the Gate of Eden with a fiery sword", or as the angel "who is over the world and over Tartarus. In the Apocalypse of Peter, he appears as the angel of repentance, who is graphically represented as being as pitiless as any demon.