The Dell is nice at that price point and size, while ASUS having free office, slighty faster CPU, and double the storage does make it useful in some cases.
I'll be joining the tablet party soon with my ThinkPad Twist. The Omni is about $100 away from the cost of a refurb Twist I got, but the twist has a regular disk drive rather than SSD unless I install one later.
Office 2013 is also included when you buy a Dell Venue.
Preordered the Dell Venue 8 pro for 250€. Stupid that it doesn't have a HDMI Port, but I guess with micro hdmi usb you will be able to do anything. Don't care about anything else.