IMO, drop away. The Ultra gives you everthing the WB does and IMO is a way better rest. The arrow cannot fall off of a Ultra just as it cannot not fall out of a WB. So it comes down to what is better, a rest your arrow has to ride on or thru, or a rest that allows your arrow to going to free flight.
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I've been using a drop-away rest for three years. I used a Whisker Biscuit for years prior to using a drop-away. In my opinion, WB's are just too loud for me to use in the woods I hunt. I like my drop-away....I put mole-skin on the prongs so when I pull back, the arrow moves almost silently on the draw. The WB on the other hand, sounded like grinding metal together. (I am really particular about noise)...that being said, the WB seemed to help my accuracy.