SwiftKey is awesome. It's my keyboard of choice by far but i've also dabbled with all the others (literally, I think!), including one of it's main rivals, Swype. Swype's USP is it's 'swipe' action text entry, which is set to come to SwiftKey via a new 'Flow' release.
Introduced in this post on the SwiftKey site, 'SwiftKey Flow harnesses the unrivaled predictive power of SwiftKey to give a completely new take on continuous input, offering real-time prediction as you begin to ‘flow’ a word on the keys.'
The best way to get an idea of how the new app works is to check out the video included below... it looks pretty great! With Google rumoured to be introducing a similar feature in the new stock Android keyboard for 4.2, it looks like the swipe-wars are ON! :)