As ever, speed. Happily both characters are fast anyway. Even with not amazing mods my Piett is 308 or thereabouts, plus the speed boost from Veers' leadership.
Moff Gideon is not in the best Trooper team, you want either Snow or Death under Veers lead. The number of situations where Gideon is better than either one of those two is few and far between.
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Vs darth revan team remove Gideon and put down either death trooper or shore trooper.
Also what secondary stats are best?