I only download free apps (free versions, free apps of the day, apps purchased with credits, etc). I never use my money to buy apps.
I have the Amazon Appstore on my Nexus 4 and Nexus 7 primarily because of the free app of the day promo. The only time I use apps from that store is when I get paid apps for free. Outside of that, I make a point to always download apps from Google Play. It's my understanding that apps from Google Play receive updates faster than apps from Amazon's appstore.
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