If you're looking for something simplistic and reliable, Google's stock keyboard is a sure fit. You'll also have peace of mind knowing that your keyboard of choice is supported with updates directly from Google. But if you're particularly set on something that utilizes swipe-input, SwiftKey offers an impressively accurate predicition engine.
Regardless of the kind of virtual typing experience you're in the market for, there are plenty more keyboard applications where these came from.
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