Ernie Ball seem to have a lower nickel content in them than the Daddario XL's, they tend to sound brighter initially but they will corrode and go dead faster. I've used D'addario strings as my main choice now for over 15 years, though I did go through a period using Elixirs, and before them Ernie Ball / Fender Bullet strings, only used EB's a ... More @Wikipedia
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