Which spoke type do I need for my bike? I have a Giant Trace X3 2012

It has 26" rims. Which of these spokes type do I need for my bike? Strongest or best match for the spokes I already have.

DT Swiss Champion Stainless PG Spokes
DT Swiss Champion Stainless DB Spokes


thank you
The difference is whether the spoke is butted or straight gauge. 



A butted spoke is thinner in the middle, which allows more flexibility without damaging the wheel, which usually makes it the stronger, as well as the lighter choice. The choice is purely personal, though, and either will function as long as the lengths are correct. Note that not every spoke in a wheel set is the same length.