There are several MBTI (Myers-Briggs Type Indicator) tests available online, but it's essential to understand that the official MBTI assessment is copyrighted and not freely available. Therefore, any online test claiming to be the "best" MBTI test might not be an official or scientifically validated version.
Additionally, the MBTI is based on four dichotomies (E-I, S-N, T-F, J-P), and it does not directly measure cognitive functions. Cognitive functions are a more advanced and nuanced aspect of personality theory that builds on the MBTI framework.
If you're specifically interested in a test that incorporates cognitive functions, you might want to explore assessments based on the Jungian cognitive function model. These tests often provide a more in-depth analysis of personality based on how individuals use their cognitive functions.
Keep in mind that while MBTI and cognitive function tests can be fun and insightful, they are not clinical assessments and should be taken as a starting point for self-reflection rather than definitive labels of your personality. Human behavior is complex and influenced by various factors, so no test can fully capture the intricacies of an individual's personality.
If you're interested in learning more about your personality and cognitive functions, I recommend seeking resources from reputable personality psychologists and researchers. They often provide detailed information on different personality models and how cognitive functions play a role in understanding individual differences. Some well-known personality models that incorporate cognitive functions include the Big Five personality traits and the Five Factor Model.