Technical specifications have absolutely nothing to do with build quality. Based on anecdotal data, the Surface 2 has a significantly higher occurrence of manufacturing defects than the Surface RT.
The Dell Venue 8 Pro is the new darling device. However, it is missing a few elements that make it suitable in the same way that a Surface RT w/TypeCover is suitable.
While supporting legacy x86 apps sounds appealing in theory, in practice it is barely useable on a tablet. People complained about the "desktop" mode on an 10.6" Surface RT and yet magically, desktop mode is just fine on an 8" Dell.
Another difference between WinRT and Win 8 on a tablet is that tablets like the Dell Venue 8 Pro require all of the system maintenance that a notebook or desktop PC require.... including AntiVirus and optimizers. Battery life on the Dell Venue 8 Pro is still a bit of a crapshoot... running apps that are not tablet-aware result in dramatically reduced battery life.
The DV8 Pro is a nice device, but it is in a different class than the Surface RT.