Questions on continuing training for professional drivers (CE available)

Evening ended up in this MT area by chance, and otherwise rather in other departments. I would have a few questions: I made my truck driver’s license with the Greens in 2005 (CE). I was already thinking if I should make a further training as a professional driver. I have already looked at the Internet at IHK Tüv driving schools etc., but this is all a bit confusing. Is an accelerated basic qualification enough? Includes 140h by a e recognized training place + Thero. Prat. Exam. At the Tüv Rheinland is offered: Accelerated basic qualification with IHK exam duration 25days Theo. 172h Prak. 14h cost 2950€ plus VAT. I have already found many different types of training 3 years then 2years or 1 year or 25days. Where are the differences. Is one learning the same everywhere? I am mainly concerned about the end of WHEN professional driver, and not that it was only a course at the end where there is only one piece of paper where it says has attended the course. Or does someone have any other ideas, or has tips on what to watch out for?