I'm confused about the difference/similarity/compatibility of these two things.
I currently have a thrive membership that includes thrive apprentice.
Is there any reason I would want member mouse?
Andrew, Thrive Architect is not a membership platform. It’s a theme. It does not provide functionality for turning on/off content based on someone’s membership privileges.
See Thrive’s comment about this here: https://thrivethemes.com/tkb_item/apprentice-quick-start/
He is talking about the thrive apprentice which is a course theme platform.
I agree there is some confusion when building a site with Thrive apprentice and member mouse.
Although I believe thrive use of member mouse, so it might be worth putting this in their support pages.