JUnit 5 vs TestNG - junit

Question

We were using JUnit 4, but we had some problems with test grouping. For integration tests we had problems with running order. We had migrated to TestNG in February 2016.
Now we are starting a new independent module for our project and part of our team players wants JUnit 5. I believe it is much better than 4th (there are some new important features, but I see some problems too).
I do not want to use JUnit 5 because of fear of possible problems in our new application, because I have experience with 4th. But I have to be more flexible for the team, so before making a decision I need recommendations from users who have experience with JUnit 5.

Answer 1

TestNG objective is beyond unit test so it covers wider testing needs like Scenario Tests, Integration Test, Dependency Test, Ordering, Parallel Execution etc, but these feature are not supported in JUnit 5.
The JUnit 5 team have these above items in their road map, but they are extending a unit testing framework to support wider range of testing needs. Lets see how the new subsequent release of Junit 5 is able to address the wider testing need in comparison with TestNG
For Spring based application Junit fits best for doing the Unit and Integration Testing as it the default testing framework and Spring Provides lots of Test API with Mockito.
For general testing and Web Automation (Selenium) - TestNG is the de facto.

Answer 2

JUnit 5 introduced a lot of new features. Currently Intellij IDEA supports JUnit 5.
Take a look at article about integrating: Using JUnit 5 in IntelliJ IDEA.
There are some useful annotations now, like:
#Tag Used to declare tags for filtering tests, either at the class
or method level; analogous to test groups in TestNG or Categories in
JUnit 4
#DisplayName Declares a custom display name for the test class or test method
See more: JUnit 5 User Guide