I created two C4DL Projects by choosing Databricks as type.
First project: I was surprised when I took a look at my DB and saw the data format, so I checked the project type and it's setted to Historical Data Store. You can see it the following screenshot and the deployment package extract:
Databricks is currently supported on Azure. Delta is required by Compose in order to create a replica of the source data (Operational Data Store - ODS).
I created both project the same way and I can't select an other options than ODS.