This is something I have been researching for a while now as we have built many courses in the past and have tried a lot of softwares.

The ones I really like are:

1. Teachable
They have a great platform and courses are all they do. They make it very easy and hands off to create an awesome course with very little worries and tech skills.

2. Clickfunnels
They also have a great "Membership" / "Course" option which we have used in the past. There is a learning curve here and requires more tech skills but overall is still great. You do have a tad more control with this option and can customize more things which you can't do in Teachable.

Currently, i'm personally moving forward with Teachable as we will be launching a few courses around How to build a writing team and how to outline and structure a blogging strategy in the B2B space. Teachable allows us to just focus on the content and makes it easy.

Hope this helps and if I can help in any way let me know

Tyler