DTU
It is only available in Azure SQL Database
Has a Basic, Standard and Premium plan
DTU is a unit used by Microsoft, it is an blend of various metrics like IO, CPU and Memory Usage
vCore
Supported by Azure SQL Database and SQL Managed Instance
There is General Purpose, Business Critical and Hyperscale plans
Offers greater flexibility over the DTU model
INFO
- Managed Instance does not support Hyperscale
- SQL Database also supports Serverless option which is not supported by the other DBs