I'm usually a very 'verbal kind of guy' so for a long time I preferred discussing the techniques and listening to my sensei. For a while though I had a very good sensei, who knew how to teach me by showing me what it should feel like. Very inspiring.
I've changed to a different instructor a while back. He can show me the right 'feel' as well, but he emphazises proper movements/technical details a lot, so right now I voted 'visual'. In the end it comes down to where you are in your aiki-development and what your teacher is like.