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Do the powers of the Destroyers in each universe have much of a variance, or are they generally thought of as peers?

I'd say there is a pretty big difference between them, tbh... Or at least, there seems to be a large gap between Beerus and the others.

After Beerus casually one-arm ragdolled FPSSB Vegeta, he said that Vegeta would be a good candidate for the God of Destruction "in ANOTHER universe":
https://i.imgur.com/o3t7h89.jpg
https://i.imgur.com/VA6Mz4c.jpg
https://i.imgur.com/WRhVJRV.jpg
...Implying that GoD-level power in some of the other universes ain't shit to him.

And during the exhibition match, Beerus was initially out-fighting all of the other Destroyers simultaneously:
https://i.imgur.com/yocHDNs.jpg
https://i.imgur.com/Hl0AcBB.jpg
https://i.imgur.com/jcFdvXa.jpg
https://i.imgur.com/8baccOh.jpg
https://i.imgur.com/05btjEl.jpg
https://i.imgur.com/sZC3Sm1.jpg

And after the contest between Destroyers was over, Beerus and Quitela were the last ones standing:
https://i.imgur.com/1YiCQtp.jpg
https://i.imgur.com/T1qoVUU.jpg