I usually build wheels with DT Champion 2.0 mm with above average spoke tension. Most run true for at least 15-20K miles, probably because I keep the tolerances at 0.001" when new. Those that don't make that far were taken out by cars and road hazards. No report of broken spoke, yet.

I recommend straight gauge because they are cheap and reliable. Also have a few friends who want the best...triple butted. These are more difficult to work with since they will twist more at higher spoke tension. Not much request of double butted spokes.