Hi David,
The worst can happen is you waste a few hours of your life with one or the other.
If you're not a developer, just don't worry about the flavor, and look for someone with basic, solid understanding of Go principles, and the base, runtime libraries.
Personally, I architected and executed the back-end portion Facebook (free goodies kinda thing) contest app for a large airline client, with hundreds of concurrent (and desperate) users in a few days, using Beego, and PostgreSQL for db.
It was a shot in the dark, but it was pleasant, the framework is stable, and the gentleman who is the main maintainer of that one is taking great pains to provide clear documentation for basic tasks.
Would I re-use it, instead of more basic plugins (Gorilla, etc) ? I don't know, it would depend on how fast you want something out "live".
cheers
s