Who does FoW Favor

[Poor Yorek]

I submit that the categories of attacker and defender are less important than whether one side is favored to win relative to another: in such case, a variant event like FoW will favor the weaker side (the underdog) over a sufficient number of plays. Certain PG-specific issues such as the leadership chain-of-command and whether one's forces can take advantage of it due to the scenario's VC's or set-up restrictions will naturally impact matters also (as Alan has cited).

This issue is also behind a home-rule I use to adjudicate initiative ties (designed to lower the variance introduced by the RaW procedure).

That being said, I use FoW so that neither side can actually be certain that it can carry out all of the activations it desires in any given turn. For example, I find this requires one to think carefully about when and how to use OBA. Another good example is the delaying of one activation before taking an AT shot to avoid the "target moved in previous segment" penalty. An adverse FoW roll here can make one's face burn hot enough to cook an omelette! See my AAR for RuRB #3 for a rather dramatic example.

Hope this helps.