Script or no script? FS

Hello, and thank you for taking my question! I am wondering if you all think it makes sense to create a script for a course I am teaching and will sell. I will record the audio which will play with slides I have created. Not sure if I should go through the process of writing out an entire script and plan to basically read it, or if I should ad lib. I will be teaching a topic I am very familiar with – one that I have spent the last five years talking through one on one with clients. Any thoughts drawn from previous experience appreciated! Thank you so much!