HTC Sense, Samsung TouchWiz, Sony Ericsson TimeScape, Motorola MotoBlur, and the plain stock Android UI are the UI's I know that are currently in the market right now. Dell is up for the game of offering the best UI for the Android OS too with their Dell Stage UI. I'm kind of in the middle with this. I like HTC's Sense UI a lot, not to mention their new Sense on the HTC Desire HD and the Desire Z. Samsung's TouchWiz is, for me, OK. Sony Ericsson's TimeScape on the updated Xperia X10 to Android 2.2 is gorgeous, MotoBlur isn't getting much love, maybe it makes the performance of the device laggy? I haven't tried or seen it work yet but base on videos I've watched its modest. But lets turn our attention to the Dell Stage UI.
