A BA in Law is more like… law with other stuff. You study legal subjects, yes, but you also do broader modules like politics, sociology, languages, philosophy  depending on the university. It’s not a straight “I’m becoming a lawyer right now” degree. It gives you a foundation in law, but if you actually want to practise as an attorney or advocate in South Africa, you’ll still need to go on and do an LLB afterwards.
Now an LLB (Bachelor of Laws) is the real deal if your goal is to be a lawyer. It’s focused, intense, and straight into legal subjects  constitutional law, criminal law, contract law, all of that. Once you finish your LLB and do your articles/pupillage, you can qualify and practise.
So basically:

• BA in Law = broader, more flexible, good if you’re still figuring things out or want law plus another angle.
• LLB = direct path if you’re 100% set on becoming a lawyer.

A lot of people do BA Law first and then LLB, but you can also go straight into an LLB if you already know that’s your plan.
If you’re comparing options, it’s worth checking how different institutions structure it even places like Regenesys Business School have their own approach to law-related qualifications.