I was using SwiftKey for quite a while, but just switched to Swype a few days ago...
...and have since switched back to SwiftKey. Swype seems like a really cool concept, but is not as generally useful as SwiftKey. Because of SwiftKey's excellent word prediction, you can type very quickly with two hands, or pretty effectively with one. Swype forces you to use one hand all the time. You can type with two hands like on the default keyboard with Swype, but then you have no advantages over the default keyboard.
I also think the way SwiftKey does the numeric keyboard and places the "?" is very smart.
I will re-enable Swype again for a few days just to make sure, but right now I'm just not seeing the advantage over SwiftKey.