I'm not a fan of the default keyboard. I find that it lags and predictions are odd. I've been a Swiftkey user since it was a paid app and I love it. My problem is that since I like to use Swiftkey there's always a keyboard icon in the lower right of the screen when I'm typing. I find that I accidentally press it while typing one handed. If I disable swiftkey the icon goes away but then I'm back to using the Samsung Keyboard which I don't like.