[Ironhawk]

Its entirely situational - not even just for the situation of SCs. Generally I would say: faster is always better. But if you know that you can safely allow the battle to run longer and that your spells are likely to be cast (due to range & fatigue) then you would be ok to not script quickness.

One special case to consider with SCs is that you might want to get your knockout spell cast on the first turn just in case the SC is scripted to fly over and kill you while you are trying to cast quickness.