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Omac
Eradicator
Doomsday
Amazo
Despero
Zod
Ultraman
Bizzaro
Solomon Grundy
Frankenstien

Most Powerful Versions

Despero - only thanks to his powers
Amazo
Zod
Eradicator
the rest will fail the math test.

Well if were takeng most powerful versions
Despero with the fire
Amazo

Neither of the top two are IMHO Superman villains, its always required a team to take them. If we're actually talking Supes villains at peak versions then the order goes

Darkseid
Ultraman
Cyborg supes
Brainiac
Manchester Black
Parasite (naturally past absorbing strange visitor when he keeps powers is a shape shifter and absorbs inertia/momentum)
Eradicator/Bizaro /Zod

The rest