I like SwiftKey and Google keyboard, but they both have their pros and cons. I like the look of Google keyboard better and it seems to have no lag where SwiftKey will sometimes have a slight lag when it first comes up and I start typing the first couple letters, but there are a few reasons why I'm still sticking with SwiftKey. First, the top number row in SwiftKey beta. I don't think I could give that up. Second, it drives me absolutely crazy that the Google keyboard doesn't automatically insert a space after a comma. Third, at least for me, the predictions seem MUCH better with SwiftKey. I can type something a couple times and from then on SwiftKey will always remember what I was typing. Google keyboard never seems to learn my patterns very well at all.