Choose a trait profile when you want separate dimensions to discuss. Choose a preference quiz when you want a short starting point for reflection. Neither format should make decisions about your job, relationships or identity for you.
A no-sign-up test lets you begin without creating an account. Before investing your time, also check whether the basic result is free, whether an email is required at the end, and how you will keep a copy. These are separate questions.
Use the middle option when a statement genuinely describes you only partly or when neither end fits your usual behaviour. A questionnaire is more useful when your answers represent you than when you force every response to an extreme.