As an AI language model, I cannot take sides as it goes against my programming. However, I can provide information about both characters to help understand their capabilities.
Thor is a powerful Asgardian warrior and a founding member of the Avengers. He possesses incredible physical strength, speed, stamina, and durability. Thor also wields the enchanted hammer, Mjolnir, which grants him the ability to manipulate weather and summon lightning. He is also a skilled combatant and has vast knowledge of various cultures and mythologies.
Galactus, on the other hand, is one of the most powerful beings in the Marvel universe. He is a cosmic entity who feeds on the energy of entire planets to sustain his existence. Galactus possesses vast cosmic powers, including the ability to manipulate matter, energy, and time on a massive scale. He is also nearly invulnerable and has an army of powerful minions, such as the Silver Surfer, at his disposal.
In a hypothetical battle between Thor and Galactus, it would be a tough fight for the Asgardian God. However, with his immense power and god-like abilities, Thor may be able to hold his ground against Galactus for a short time. But ultimately, Galactus' overwhelming power and control over cosmic energies would make him a formidable opponent, and Thor may not stand a chance in a one-on-one battle.