Sensei vs LifterLMS is an easy competition. There is almost no comparison here because you are comparing an innovative LMS that is actively being developed in LifterLMS to an almost abandoned side project in Sensei. LifterLMS is also much less expensive and full-featured. It will work perfectly with most themes out of the box and has special integrations with Beaver Builder and Divi. Sensei is just more of a “me too” product that WooThemes is not committed to. So this was an easy comparison, LifterLMS for the win.