I'll have to watch Spencer's Mountain again sometime. I haven't seen it in years. I do have all 9 seasons of The Waltons and the 6 made-for-tv reunion movies including The Homecoming in my digital library. I watched it all for the first time last year and can't remember why I didn't watch it when it was on the air. I loved it.
I'm just starting season 5 of Little House on the Prairie and although I love both series, for me, I think Little House might have the edge.