They go hand in hand frankly. Also I feel they both deserve equal and adequate attention. If you build something and it is missing features you are failing, s

They go hand in hand frankly. Also I feel they both deserve equal and adequate attention. If you build something and it is missing features you are failing, same as if you build something and it lacks a user experience you are failing. However which is more noticeable? I would say it depends on the feature. Ultimately, whether smart or dumb an end user will know if the user experience is lacking. If a feature is missing though a user might or might not notice. Depends on the feature. Features are built to provide one part of the user experience, the UI itself is what provides the overall user experience which is to an extent dictating by the features required. Make sense?