What is best Xcode version that works with the most existing devices [closed]

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What is the best Xcode version to use to compile an iOS app that will run on the greatest number of devices already out there? iPhone iPod

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You should always use the latest stable version. As of today this would be Xcode 4.1 if you are on Lion and Xcode 4.0.2 if you are on Snow Leopard.

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Obviously, the latest one. To date, 4.1