I think it depends. At the start, Melkor was stronger obviously, because he was of the Ainur and (had things gone smoothly) had the abilities to becoming part of The Valar full-time. In comparison with all this, Sauron was just a servant, an assistant, Melkor was Boss.
As far as I can remember, Melkor tried his hardest for victory and failed several times as did Sauron. But Sauron, though unsuccessful in the end, kept it up for longer and got further than Melkor.
Odds and evens weighed up I think in strength, power, armies, success, evilness etc. (not Rank/Godliness) they come out roughly even.
Lúthien
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