YugabyteDB and CockroachDB are both distributed SQL databases that offer scalability, high availability, and geographic distribution. YugabyteDB was architected to support all the above features, including high performance in terms of providing massive throughput and extremely low latency, being cloud native, open source, and supporting a wide range of PostgreSQL-compatible features. In contrast, CockroachDB has rewritten its SQL layer in Go, which may result in less advanced feature set compared to YugabyteDB. The two databases were evaluated using the YCSB benchmark at scale, with YugabyteDB showing on average 3x higher throughput than CockroachDB and outperforming it in all YCSB workloads in terms of throughput achieved whether using hash or range sharding. Additionally, YugabyteDB was found to have better write/update latency and read latency compared to CockroachDB. The performance differences were observed due to the use of RocksDB by CockroachDB, uneven compaction effects on performance, and backpressure issues with CockroachDB's lack of throttle for write requests. Despite these differences, both databases are capable of handling large amounts of data and can be used in real-world enterprise scenarios.