I like both styles of wheels too! It's hard to say which one is better, to me it really depends on the Mustang color/styling/model. Unfortunately, the Machined AMR's have been discontinued for now. Currently we don't have plans on bringing them back, but things are always changing here, so I wouldn't rule it out!
I'm sorry for the inconvenience, I hope there's a GT500 wheel that fits your taste or another finish AMR. Let me know if there's anything else I can assist you with!