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Pgsql as an interface does not have vendor lock in that Spanner has. You can move to the cloud and back much easier.

Google seems to be working on offering Postgres interface compatibility to Spanner as well: https://cloud.google.com/spanner/docs/postgresql-interface

In general I think Spanner is more focused on availability than performance (especially across different workloads e.g. analytics/transactions). Also, the Postgres shim for Spanner is not 100% compatible and less mature than Alloy. Last, Spanner is expensive!

Imho, Spanner used to be on the expensive side. But with the introduction of "compute units" and now 4TB storage per node, the price for Spanner looks pretty great.

Links: https://cloud.google.com/spanner/docs/compute-capacity https://cloud.google.com/blog/products/databases/spanner-has...

Spanner usually handles transactional workload, but AlloyDB as HTAP may process the analytical workload at the same time, I think.