¿Who is stronger, Onslaught or Muten Roshi?

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.

Muten Roshi, also known as the Turtle Hermit or Master Roshi, is a pivotal character in the "Dragon Ball" series. Born in the year 430, he is renowned as the master of the Turtle School and one of Earth's most formidable martial artists. Throughout the series, Roshi has trained key figures such as Goku, Krillin, and Yamcha, imparting iconic techniques like the Kamehameha. Despite his elderly appearance and often humorous demeanor, he possesses exceptional strength and skills, demonstrated in various tournaments and battles. Beyond his role as a mentor, Roshi has been an active member of the Z Fighters, participating in Earth's defense against numerous threats. His longevity and wisdom make him a respected and beloved figure within the "Dragon Ball" universe.