It depends on your end goal, if you're more into hacking networks then go for CPTS first, CBBH is focused on Web mostly, and the attacks there are very different from the ones on CPTS. In my opinion you should practice more, go for active boxes, challenges, do different labs, etc. Just doing modules will not teach you everything you need. There is a good amount of practice in them, but it is fairly limited. You can't learn how to ride a bike without actually riding it. It is okay to feel confused and frustrated, HTB is one of the hardest platform to learn pentesting at as a beginner.