Be aware that all of the frameworks are targeting Swift 3 right now, so it's a bit unstable until Swift 3 is officially released. But the ecosystem is going really strong =]
I'm using Vapor on a new project and I really like it. The biggest stumbling block at the moment is that the Swift Package Manager can't resolve packages having dependencies on different versions of other packages. I'm using Vapor with Zewo's PostgreSQL ORM, and upgrading either one is an exercise in frustration.