It might seem strange that two beings of the same created "order" would have extremely different power levels, but there are at least four reasons why one Maia (Sauron) might be more powerful than another (say, Gandalf).

For more on the "Morgoth's Ring" concept, check out The Red Book's great video on the subject: https://www.youtube.com/watch?v=2eVGGmVMpc8

He also has his own video on essentially this topic, though with a broader focus: https://www.youtube.com/watch?v=zoVzNMDQ3mE

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