I actually prefer Google+ to either of them. I am making new connections there with whom I've actually been able to have interesting conversations. I hate to admit it, but this often doesn't happen on Facebook where my family and people I actually know hang out. Facebook seems more like an open house where people make small talk and share pictures. I have gotten to know a bit more about my brother through the kind of things he shares, but he isn't very talkative unless we speak in person or on the phone. My nephews hardly ever post anything, and I suspect neither checks in very often. I'm getting to know my cousin, whom I've never met in person, a bit through what he shares, but not as well as I'd like to. I do stay aware of the activities of friends who live far away or that I no longer bump into around town as I used to when we belonged to the same organizations. If I could get my friends to switch to Google +, I'd quit Facebook completely -- or at least stop posting.
I think Google+ makes it easier to meet new people and engage them in conversations. Their circles are easier to use, and people who don't know each other can follow each other without claiming to be "friends." The privacy controls are more intuitive and easier to implement than those on Facebook. The conversations are often more stimulating, and when you log in , you can immediately see notifications of what you might want to respond to in one easy interface, from which you can circle people who have circled you or answer posts you've responded to that got more responses or that mention you. You don't have to leave the page to do that.
Twitter has proven even less useful than Facebook in engaging people. It's more an information source. Although I've had a few conversations with people who Tweet, you can't go into any depth in140 characters.