I'd like to see DR AND DR. Skyrim uses DR only, 480 or so armor points = 85% DR.
Fallout 1 & 2 had both DT and DR for each set of armor (varying for different types of damage, but thats pretty specific) and IMO that was best. The DT cuts off it's value in damage, and the DR rolls a value off of that and any other damage that manages to bypass the DT.