Rather than asking people which view they prefer and why, it might be better to build a better understanding of: 1. When do they look at their overall roadmap

Rather than asking people which view they prefer and why, it might be better to build a better understanding of: 1. When do they look at their overall roadmap view? 2. Why? 3. What actions do they often take as a result (e.g. print it out for upper mgmt, drag around the timing, ...)? 4. Why do they need to do those things? 5. ... I could be off base but, based on your questions, I'd suggest you dial up the time you spend interviewing your customers about their problems. The book 'The Mom Test' is a great guide for how to put this advice into practice.