We currently are running 2018.3 version of TFS instance in our environment and were looking to upgrade to the recent version of Azure DevOps Server 2019. I looked up online at various places to find out the differences between these two version and was unable to find one. Hence wanted to check with the community here.
I think, you should find that`s new in the AzDo 2019. There are many additional features were added into 2019 version. Here is the index of new features: Azure DevOps Server 2019. If you have interest in some specific areas, you can point them to discuss. For me: