Which Adobe Illustrator Plan Should I by?

Hello. I am working with Illustrator 2026 as a hobby. I create logos. I want to get a subscription to use its AI capabilities. Which Adobe Illustrator plan should I buy for this?

By AI, I mean something like: "Combine the letters C and A and give me a vector image."

I want to do things like that. Which plan is most suitable for me? Firefly seems to be for more professional work. Could you give me some information? I'd like to try it for a month first.