From my benchmarks (oh hi I'm the author of a multi-provider elliptic curve digital signature library for Rust), ed25519-dalek (with curve25519-dalek's AVX2 backend) seems to be winning:

https://twitter.com/bascule/status/1024313525554925568

...for both signing and verification, beating out the fiat-crypto P-256 implementation (in ring, a Rust cryptography library that wraps BoringCrypto).

libsecp256k1 seems slightly slower than fiat-crypto's P-256, even with the endomorphism optimization enabled. The Rust crate presently provide knobs for either of these things, hence the low Signatory benchmarks.

These curves predate Broker-Stevanhagen, however all of the implementations I'm comparing are production(-ish) quality.