Azure SQL Server Database serverless or Elastic pool

I’m just getting started with Azure SQL Database and have some questions about pricing. I currently have about 7 databases in use with a free student subscription plan for a development environment. Most of the databases are only used occasionally when needed.

I’m wondering if I should use Elastic Pools to share resources among these databases to save costs and resources, or if I should opt for serverless computing to turn off databases when they are not in use. Thank you