The spoke with the lowest torsional strength will be the worst, which usally means the thinner the spoke, the more twist you will get.
True, however I've used 3 different brands with the same gauge of 1.8mm being the thinnest.
DT Comps- Least twist
Sapim Race - About the same as DT's
Pillar - Nightmare- Then again these were triple butted, 2.3 at the head, 1.8 in the middle and 2.0 near the spoke thread.