Coursera and edX are very similar. edX is also an online course provider through which you can enroll at courses offered by over a 100 leading institutes from all over the world. It brings university-level courses right to your bedroom! There are courses on a broad range of topics and you can earn a certificate of completition.
In comparison to Coursera, I feel like most of the courses offered on edX take a longer time to complete (around 10 weeks). This means that completing a edX course may require more dedication than completing a Coursera course. On the other hand, you are sure to gain a deep understanding on the topic the course is on, and edX definetly offers a lot of interesting courses! In conclusion, if you have the time and patience, definetly go for a edX course if you find one that interests you, even if it takes several weeks to complete. Overcome your fears and challenge yourself!