You don't always have to have a direct attachment. My CTI2 doesn't and it works beautifully.
I think there are a lot of important factors here. First, what will your insurance pay for? Health insurance is a tricky thing and some durable medical equipment companies are not honored by your insurance. And what will the MD write a prescription for? Do they have a contract with various companies? A lot of the time, it is the MD's office that does the fitting.
But once again, everyone will have an opinion. And that's great! Why did I choose CTI? because it was so light weight, I could get a small brace esp for me and skiing, and I could get it in purple.