They are both approved by the ACCA, and they are both as good as each other 🙂
If you are watching my free lectures then you do not need a Study Text – the lectures are a complete free course and cover everything needed to be able to pass the exam well.
What is vital is that you buy a current edition of a Revision Kit, because they contain lots of exam standard question to practice, and practice is vital to being able to pass the exam.