UX and Data science are two different areas to compare and tell which is more in demand. One is into design and other is on the tech side but the former has to be part of the later depending on the solutions developed using Data science. But, comparatively UX field is in more demand compared to Data science because it does not need any background in specific to get into UX field and past few years there is a huge demand, especially in India, where a lot of colleges have started offering the course in UX and many online opportunities have also made it more reachable.
Data science is a field that comprises more scientific methods, processes, and algorithms to gather details from data in different forms. This field has been in existence for many years as different but with the demand for Ai and Machine learning which is the buzzwords, the Data science is now in limelight and many coders are choosing this as next career option to jump to.
In nutshell, both are in demand but yes UX takes the lead in the race.