Legacy or new build system when working with Swift's source in Xcode

A completely noob question. Sorry if this has been asked before.

After I compiled the tool chain with the --xcode flag, opened the generated Xcode project file in Xcode, and let Xcode automatically create schemes, Xcode shows an orange hammer and suggests that I should switch to using the new build system. Should I use the legacy or the new build system? What are the pros and cons for each for compiler development?

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