Do you ever hear parents who send their kids to school talking about curriculum?
Do you know why? Because it doesn't matter. If you use curriculum or you do not use curriculum, that is a very big question. Riverdale is a school that is following child-directed learning: no set curriculum. Most public schools are to-the-test learning: established curriculum. That is a huge difference. Beyond that, if the kid is doing well on the test, the curriculum doesn't matter.
So why are homeschool parents obsessed with curriculum? It's a red herring. There are huge, enormous questions for parents to be asking instead:
2. Is it a good model for girls to see moms making their life revolve around their kids? Should dads be more involved?
3. Should kids focus on learning languages and music? The benefits to learning these at a young age are huge.
Of course those are not the only three big questions, but those are three of the 300 questions that are way more important than choosing what curriculum you use.
I think parents use the choice as a way to bury their heads in research. As if that will somehow make them a "good" homeschool parent. But the more time you spend trying to figure out curriculum, the less time you are spending figuring out answers to really meaningful questions.