IHS Markit versus ISM Manufacturing PMI

IHS Markit and the Institute for Supply Management (ISM) compute composite indexes covering the US manufacturing sector. Both are weighted up from component diffusion indexes measuring five economic concepts: manufacturing output, new orders, employment, supplier delivery times, and inventories. Both sets of diffusion indexes are survey-based measures in which respondents are queried about the current month's activity relative to one month prior. Beginning in early 2017, the ISM index moved sharply and persistently above the IHS Markit index. Which one is providing a better signal? 

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