Justin compares the three popular Java Software Testing (mostly unit testing) frameworks - JUnit, TestNG and JTiger. He provides an unbiased view IMHO despite his lack of experience in TestNG or JTiger before the comparison.

He couldn't decide a clear winner between these java software testing frameworks. However he does provide a detailed view on their capabilities.

I would recommend new users (of unit testing) to choose an annotation based tool like TestNG or JTiger.

Read the comparison here.