Should i get 16 gb or 8gb for my mac 2011 running macos hisierra

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The app I want to develop is mostly running in the background, so there will be no heavy graphics or computations.

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I do not have a high budget, which is why I would prefer to buy a (used) Mac with the minimum required specifications that is able to run the latest version of Xcode and iPhone simulator. I need to buy a Mac to run Xcode for iOS app development. I'm planing to develop an app with React Native for Android and iOS.