¿Who is stronger, Abraxas or Onslaught?

Abraxas is a powerful cosmic entity from the Marvel Comics universe and an enemy of the superhero team the Fantastic Four. He is a being of immense power who exists outside of the normal boundaries of reality and time. Abraxas possesses a wide range of superhuman abilities, including super strength, super speed, energy projection, and the ability to manipulate reality. He also has access to advanced technology and magical powers, making him a formidable opponent for any superhero. As a cosmic entity, Abraxas is driven by a desire to destroy all reality and create a new universe in his own image. He has clashed with the Fantastic Four and other superheroes numerous times in his quest to achieve this goal, and has proven to be a formidable and dangerous foe.

Onslaught is a comic book character created by Marvel Comics and is known to be one of the publisher's most powerful and feared villains. He is a cosmic being created by merging the minds of Charles Xavier and Magneto, two of Earth's most powerful mutants. Onslaught has a number of supernatural powers, including the ability to manipulate people's minds and behaviour, superhuman strength and the ability to manipulate magnetism. He is also virtually indestructible, making him a formidable foe for any hero who confronts him.