Go is a much, much easier language to learn; it's one of the easier mainstream languages to learn.

If you really have to ask, like it's a headscratcher between the two, learn Go first and see if you're happy where you land with it. Go is the more popular of the two languages; there's not much "risk" to either of them, but there's marginally less risk for Go.

Rust is the more ambitious of the two.