I've done both. Sometimes I'll come with a handwritten or typed list of topics or thoughts. Sometimes there's a major thing I know that needs to be discussed that I don't need to write down. Other times, we just start talking and land on something. Some of my most helpful sessions have been when I haven't had something planned. Though there have also been a few where I've just sort of rambled about things and feel I didn't accomplish much. Or where I had something I wanted to talk about but didn't bring it up till closer to the end. Now if I have something bigger I want to address but am maybe not ready at the start of the session, I'll mention it to T, and he'll bring it up partway through. Like, "We have 20 minutes left, if you want to talk about x." Which is helpful.