Edit: Sorry, this is a double post from another thread and this is in the wrong thread. Would have deleted, but already has a reply.
The DX2 appears to also have mirroring based on the user manual.
Two additional percs the Rev has is 12gb of actual internal storage for media and apparently a dedicated video chip.
The Revolution IMO would be a no brainer, but per the user manual, the device its HEAVILY Binged. Besides the obviously counter intuitive use of Bing on an Android device, the extra app layer means a longer delay for OS updates.