This is a difficult question to answer, because they are very different compute types. A better comparison would be the Azure Synapse Serverless SQL endpoints and the Databricks SQL. In that comparison, the databricks SQL endpoint is much much more performant, but also costs about 3x what the Synapse Serverless SQL compute costs. The costs for both types of serverless compute are still much lower than keeping dedicated compute resources running, whether Dedicated SQL Pool or Databricks interactive cluster.