I always, always get Bonanza and Big Valley mixed up. They often seem like the same show!
You need to watch more classic TV.
I do! I've been slacking. I lost my MeTV for a few months. I was diligent about watching the lineup every single night, along with Leave it to Beaver in the morning, and Perry Mason right after that before my day began. Thing is, after Perry Mason, I think that's when all of those westerns came on.
I've never, ever, ever had any interest in watching The Waltons, so missing that is no skin off my nose. I never understood the appeal. I often get it confused with Little House on the Prarie, another series I've simply never even been remotely interested in watching, (which would explain why I may often get them confused in these trivia questions).
As a kid, I remember watching Big Valley and Bonanza at night with the folks after dinner. I have a feeling I probably got them confused even then. My takeaway from whichever show is applicable here/there, was, "My God, Barbara Stanwyck has the tiniest waist I've ever seen!" Yup, that's all I remember.