I use a wider saddle than my sit bone impression points to but, I think its more of a design attribute. Depending on the particular saddle, a wider one might work better or a narrower one. I don't think this helped you much but there is no hard and fast rule for saddle fit and satisfaction. Perhaps if you are more in a racer position (40-45 degree back angle) then go with the narrower one. If your back is typically 45 -50 degrees, then the wider saddle. In any event, get a saddle that you can return. Specialized for example provides a 30 day trial with any saddle you order from their website or authorized dealer. I think several other companies do the same.