Our 2-years experiment with using NUnit as a unit testing framework is complete.
We migrated to MSTest V2.

My conclusions:
1) MSTest is more reliable than NUnit.
See NUnit screw up.
2) MSTest is slightly simpler/restricted than more flexible/complex NUnit.
3) MSTest is slightly faster than NUnit (about 7%).

But generally, MSTest and NUnit are comparable.

This article helped us to migrate:
https://cklutz.github.io/2018/10/30/Convert-NUnit-To-MSTestV2/