The Short Answer
A Bachelor's Degree (NQF Level 7) is the most theory-heavy and academic path, usually 3-4 years, and is required for regulated professions like law, medicine and engineering. A Diploma (NQF Level 6) blends theory with hands-on, workplace-focused training, usually over 3 years. A Higher Certificate (NQF Level 5) is the shortest route in, usually 1 year, and works well as either a career starter or a stepping stone into a diploma or degree if your APS didn't get you in the door straight away. None of them is objectively "better" - the right one depends on the career you're aiming for and how you learn best.