GoBGP is designed to exploit todays multicore processors. Golang makes it extremely easy and simple to write concurrent code.
GoBGP is designed to be easily integrated with other software with its RPC APIs instead of manually changing its config via CLI. GoBGP also supports its CLI though.
GoBGP is implemented based on an IETF draft, vendor-neutral model for network configuration and policy. Imagine that you can configure BGP across multiple vendors' gear with the single model.