There are some decent ones. Plus Coursera courses can be endless and dry. Udemy has a more... eeh free market model where the best stuff rises to the top and you have more competition. Even the quality of the video/áudio on coursera is occasionally very bad.

Having used both I think they’re just different. Udemy has very neat short courses while Coursera is really long and for some purposes, overly long and detailed.

Decent courses - I did a pretty great drawing course and Unity programming intro courses on Udemy that I really really enjoyed.