Hi @gkhalifah,
As Dynamo is getting faster performance wise and introducing new features, extensions and nodes, it is worth to work with the latest version if you do not have any limitation. Since Dynamo is not backward compatible, file sharing can be a challenge if other people are using older versions of Dynamo.
Related to packages, you can use some of packages that are not updated by installing DynamoIronPython 2.7 package in Dynamo 3.0 and further versions that comes with Revit 2025. Furthermore, you can check this discussion to see which package is compatible with which version of Dynamo. It will help you decide better.
We have also updated our package management experience starting with Dynamo Core 3.4. Currently, it works in Dynamo Sandbox 3.4 and further versions. This version of Dynamo Core has not been integrated yet to Revit. With this update, if the package author updated their package information about version combabilities, you can see which version of package works with your current Dynamo version on the Package Manager window. The new install button will set the package version that is compatible with your current Dynamo version, automatically. Here, you can find more information about this.