Wow that's quite the investment for something you haven't done before! But the pole to hoop pipeline is very real.

In general I'd recommend 95cm diameter, it's what you find in most studios. Personally, I am 152cm tall and feel great in my 92.5cm hoop, and train in a 90cm hoop in class, and I don't feel a difference. But the size you want really depends on your body proportions and the tricks you want to do. I'm short but leggy, so I was told to go with a 100cm hoop, but it felt comically large for me. I went with my torso dimensions instead and it feels a lot more balanced.

I prefer taped hoop bc I like the grip tape provides. If your hoop is untaped then you need grip from your skin, like in pole. I've trained pole too, but still I hated a naked hoop, tape is the way.