What difficulty should I play batman arkham city in?

I was wondering if I should play batman Arkham City in hard, or normal. I finished batman arkham asylum on hard and was wondering if batman arkham city is just as challenging as Batman arkham asylum on hard. Or is it more challenging on Arkham City?What difficulty should I play batman arkham city in?
I breezed through Arkham Asylum on hard, and yet I still struggled with Arkham City on medium. The thing was getting used to the new AI, using new gadgets, and different types of enemies while fighting. If you want the challenge, play hard, if you are thinking of playing it more than once, start with medium, so when you play on hard it will be much easier.What difficulty should I play batman arkham city in?
Play on normal its kinda challenging and plus you don't wanna play it on hard and unable to beat certain parts when your half way into the gameWhat difficulty should I play batman arkham city in?
Go Ahead and Play on Hard.