Prisun... If nyxes have any advantage "becase they're in the Taus" - it's not a specific location-relaed advantage, but environment. And it wold work just the same in o5, o41, T31 and wherever...
And terrain is neutral. The same advantages as it probably offers us - it offers the enemy. Now given, that Sabres and Nyxes meet up on even terms, the winning factors are lagshield quality, dodging and weapons. Sabre has better. In all 3 areas.