Related: Oxide's podcast, "Whither CockroachDB," which reflects on experience with postgres at Joyent, then the choice to use cockroach in response to prior experiences with postgres.

https://www.youtube.com/watch?v=DNHMYp8M40k

I'm trying to avoid editorializing in my above summary, for fear of mischaracterizing their opinions or the current state of postgres. Their use of postgres was 10 years ago, they were using postgres for a high-availability use case -- so they (and I) don't think "postgres bad, cockroach good." But like Bryan Cantrill says, "No one cares about your workload like you do." So benchmark! Don't make technical decisions via "vibes!"