I don't see why a wider chain would stretch more slowly. It's just erosion around the pin which causes "stretch" - maybe if the the links were wider then they would wear down the pin more slowly. I don't really think it would make much difference.
@Sparky started
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I don't see why a wider chain would stretch more slowly. It's just erosion around the pin which causes "stretch" - maybe if the the links were wider then they would wear down the pin more slowly. I don't really think it would make much difference.