no sure about the kenwood, but a customer's car that I work on has the Pioneer, and I have the Alpine. IMO, the Alpine's UI is much cleaner and user-friendly. I also think its Ipod interface is better.
Does that mean that if you don't look for navigation (say you have an iphone) but want great connection with the phone, that you think Alpine's units are also appreciably better than the Pioneer PH-P800BT? I've been wondering about that one since the design is so clean and I heard some good things about it. I did read that you have to get used to it but that it can feel quite intuitive. But its interface with the iPhone sounds like it is spot on, from what people say, even with the iPhone. The crazy thing is that what holds me back is the blue display when my 2003 Forester has green displays. Is that silly?