I tried all 3 options in the C172M - suction mount/knee-board/yoke mount and found the latter the best option.
I found the suction mount obscured either my outside view or some of the panel instruments.
I tend to sit high and forward in the C172 and found the knee board got in the way with yoke full aft. Also looking down makes me uncomfortable flying VFR.
With the RAM mount on the yoke make sure you get the extra extension arm as well so it can be adjusted fully. I ran the arm UNDER the yoke. This way all panel instruments can be seen and there is full movement of the controls even in portrait mode. Hope this helps.