The quality of a data science course on Udemy, or any online learning platform, depends on the specific course and instructor. Here are some factors to consider when choosing a data science on Udemy.

• Check the instructor's credentials, experience and reviews from other students.
• Review the course curriculum to ensure it covers the topics you want to learn.
• Read reviews and ratings from other students who have taken the course.
• A good data science course should include practical exercises, real world examples and projects.
• Data science is a rapidly evolving field. Ensure that the course is up-to-date and relevant to current industry trends and technologies.
• Check support and resources.
• Consider the course's pricing in relation to your budget. Udemy often has sales, so you may find courses at discounted rates.

It's also worth exploring other online learning platforms, such as coursera, edX, or DataCamp, which partner with universities and experts to offer high quality data science courses.