Is the only difference between the two is that swift-sh can include external dependencies? (link to swift-sh)
What does swift-sh mean for Swift?
It's just a tool for you to run swift code like command line.
Actually, you can write swift code and run the code using command line tool. The swift-sh makes it easier to finish this process.
One big difference is that in swift-sh, you can use external dependencies. AFAIK, that’s not possible when running it like /usr/bin/swift foo.swift.
Actually, clicking the link you posted and reading the first sentences of the README explains just that.
It does so by building a package that is then run. This recent article on NSHipster also gives a nice overview of what it does.
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