I use Swift every day and appreciate it a lot, while I have only cursory experience in Go, mostly because it didn't have any real debugger support in the past. But any comparison is rather shallow because at the moment they don't really address the same target usage, and Swift is only minimally supported on the server side where Go is generally used. Give it a couple years and the comparison might be more meaningful.

Once Jetbrains Gogland is up and running I will be playing more with Go.