I will chime in and also say that for spinners/spoons, line doesn't much matter, especially in winter. I use 15 lb. mono attached to hardware in the winter; that is tied to 30 lb. braid.
Funny story about my first year of steelheading. I was fishing for nearly a year, without any steelhead and toward the end of the day, grumpy and without patience. I had just broken off a spoon, running out of time for the day, and in a last-ditch effort for a few more casts, skipped tying another mono leader to my braid and just tied the spoon directly to the braid (being smart enough to switch to a uni knot for the braid, instead of the standard clinch used with mono). Made a couple casts and holy smokes, actually got hammered by a steelhead. Only my second ever hooked (I lost the first, so was still batting zero against steelhead).
The fish exploded from the water, then bolted down the river. I am inexperienced with the pure rush of these fish, had never actually landed one, and feeling a little scared, then got a bright idea, "Hey, I'm running 30 lb. braid, this fish is going nowhere!" I clamped down the drag and fish slows to a crawl. It thrashes some, lurches...then my line goes limp. What? Reel in and it pays everyone to remember from my debacle that you are still only as strong as the weakest link; the hook bent out. My 'brilliance' had me still batting zero against the steelhead after my first 9 months of that first year. LOL
But, the point being, hardware tied directly to a dark braided line didn't deter the fish from biting. A 10 lb. mono will do nothing to spook them from a spinner. In summer, I do switch to lighter 8 lb., but that's mostly because the smaller spoons I use don't sink well with thicker line.