The NVL style is a style that is highly-specialized for text-heavy, plot-heavy games with extensive narration. On the opposite end is ADV-style, which is specialized for VNs with moderate to low-levels of narration and high levels of dialogue. The major reason NVL has mostly fallen to the wayside is that VNs that need its unique qualities simply aren't being made anymore. Companies like Light, Propeller, and Nitroplus have become less and less prolific over the last ten to twelve years, while companies like Navel and Will reached their peak between 2015 and 2018, when the JVN industry itself peaked and began its drastic decline.
The NVL style never really caught on with EVN companies, so it is mostly a non-issue, with the ADV being what most people recognize as 'visual novel style'.
For more particular UI aspects, I have a particular dislike for Purple Soft's translucent menu at the top of the screen that tended to go off at random times through accidental button presses, requiring me to back track manually using save games just so I wouldn't miss plot points. Most VNs have a menu with text and sound options, with gameplay ones often having control and hot button options as well. Most UI options are pretty standardized, whether in the west or the east, so you can play any VN without an instruction manual or much fumbling.