It depends on whether you think the benefits outweigh the disadvantages. For me, the main benefits of having a script are that I don't have to spend a minute going 'um' at the camera for every line I try to think of, and I know I've said everything I had planned to. If these aren't a massive problem for you, then I would say don't make a script, but if they are (or if you have another problem that can be solved by having a script), then definitely think about it.
Another option would be to just make a list of key points to cover (if you don't already).