I've never done Twitter so I guess my vote would be Facebook even though lately I'm not a fan of the censoring happening there and have a new account on MeWe which is similar to FB but no censoring!
The reason I never signed up on Twitter is because when it first came out I had a friend who signed up and she was our director of the flute choir we were in. The group was invited to play at my church's ladies group Christmas party and between every single song and throughout the evening she was looking at her phone. It was frustrating so I resolved to not become involved in Twitter.
Facebook for me. It's easier to connect with friends & family, while twitter is primarily for sharing ideas with the world. Facebook has a nicer user interface too.