Depends on the situation....
If I am fishing clear open water I use 100%10-12 Lb.flurocarbon....
Ifthe water is stained or heavy cover, I use #30Power Pro.
If I am on a budget, I use 12 Lb. regular Stren.
I've had HORRIBLE results with Trilene, I'd rather use the $4.99 for 1000yds of Shakesphere