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[General] Which fictional world has the strongest magic?

I was wondering if the magic in LOTR matches up to the magic in say, Harry Potter.

Is one noticeably stronger etc.? Not limited to LOTR and HP just examples.
gpt
The Dresden Files may be a contender for the most powerful magic. Early in the series there are powerful rituals that are easily on the scale of WMD's. The simple spells are probably on the whole less overtly destructive than some things in Harry Potter, but scale extraordinarily well with preparation and setup.

Tolkien's magic is difficult to peg. Magic in middle earth is divine, and the users of said magic are themselves demigods. To complicate things further, we don't really see these beings flexing their metaphysical muscles, so to speak. Gandalf fell through fire and flame battling Durin's Bane and battled for days. Saruman corrupted Theodin and the Shire. Sauron's war at the end of the first age is only told in legendary form. There's very little to go on, because the power of magic isn't what the story is about.