Hey Rockpapercopy great question!
I've only taken courses from Udemy before, but they were very good! I took some on email marketing, and then some introduction courses to Adobe After Effects and Blender. Some of my coworkers are really big fans of Lynda too!
The only other one I really loved was Masterclass. It was really expensive, so I did the free week trial when I had a free week and just rocketed through a bunch of them. I don't think I could personally justify the price, but the content and production value was unbelievable.