Re: If you have trained in both Aikikai and Iwama, please help me...
In my mind what makes the Iwama "style" interesting is the structured pedagogical method. As far as any other demographic, I think you'll find the same wide spectrum within Iwama dojo as any other.
Inagaki Sensei is, I'm told by my two instructors who have both trained with him, very good. I look at him in films and really admire his precision. I won't comment further.