There's a feature matrix here [1] comparing YugaByte to CRDB, TiDB, Aurora, CosmosDB, Spanner, MongoDB, FoundationDB, Cassandra and Dynamo. No idea about performance characteristics though.

[1] https://docs.yugabyte.com/latest/comparisons/

edit: there is a relatively recent blogpost comparing the two here: https://blog.yugabyte.com/yugabyte-db-vs-cockroachdb-perform...

Key summary from the post:

In a nutshell, YugaByte DB delivers an average of 3.5x higher throughput and 3x lower latency compared to CockroachDB. Following are the detailed performance characteristics at scale (millions of rows) for internet-scale transactional workloads:

5x more insert throughput, 9x faster 4x more query throughput, 3x faster 4x more distributed transactions throughput In addition, YugaByte DB offers additional features such as read replicas (for timeline-consistent, low-latency reads from the local region) and automatic data expiry (by setting a TTL at table level or row level).

Obviously to be taken with a grain of salt as with all benchmarks doing head-to-head comparisons.