I've yet to test my BGs against my Wrens, as I take the BGs out when there's fresh and reasonably deep snow. The Wrens have been used in either older snow or less than 4-5" of fresh. In those respective conditions, I found both skis to be delightfully maneuverable in both trees and bumps.
EDIT:- Both skis are 189 and Wrens are the 108 under center.
I took the Wrens to Taos last week and was thoroughly enjoying the fuck out of terrain like this following a few inches of fresh (Wren Territory, IMO):
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