[Product Question] Azelaic Acid: The Ordinary vs. Paula's Choice, which one do you prefer and why?

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I've been (really, really) happy using TO's Azelaic Acid, but have been wondering if any of you guys have switched to Paula's Choice; and why exactly?I'm contemplating on trying PC's Azelaic Acid Booster, but since Paula's Choice is a lot less budget-friendly, I'm curious to hear your opinions about it first.
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Submitted by Freshestdaisy