Both UI (User Interface) and UX (User Experience) design are critical to a software product’s success. A well-designed UI helps users navigate the product easily, while a strong UX ensures that the overall experience is intuitive and meets the users' needs and expectations. Neglecting either aspect can lead to frustration, decreased user satisfaction, and ultimately a lack of adoption or use of the software. Therefore, the most accurate response would be:
Both are equally important.