I think this really depends on what stage you are at. In the earlier setting up phase they were very willing to discuss other methods and hypotheses as these related to the literature searching and subsequent justification of my approach. Later on in the PhD journey, I found that much more was down to me to direct and specify the final approach as this is the time that you are becoming an independent researcher. Our discussions at that point were more about what I had found and how I had interpreted this way, along with my follow-up direction. Obviously, they would add advice/comment as necessary!