The most accurate MBTI personality test is considered to be the test offered by Keys 2 Cognition. This test is not dichotomy-based, which makes it more accurate than other MBTI tests. According to users on Reddit, the Keys 2 Cognition test is the most accurate because it provides a more nuanced understanding of personality traits and preferences. The test is based on the theories of Carl Jung and is designed to elucidate the psychological modes of people in how they perceive the world and make decisions. The test is carefully selected to provide the most accurate results and understanding of personality types.