The line class you select is dependent on several things. Personal preference also comes into the equation. You’ll find the most popular line classes between 4 pounds and 15 pounds. This is also dependent on whether you’re using braid or mono. If I’m using a dropper loop with a live minnow, I’m generally hunting a larger class of fish. In which case, I’ll be using a 15-pound braid. If I’m using a Ned rig, it’s a sports finesse affair, and I’m using no more than 6-pound mono – often only 4 pounds. If you’re looking for a good standard for most rigs, I like using 6 to 8-pound mono. More often than not, I’ll use mono when chasing trout. Mono is more forgiving on trout, and they have particularly soft mouths for which braid can be a little too aggressive.