I would go 20 lb bright colored braid with a 12 lb flouro leader. Braid floats, flouro sinks. I like the combo because if I'm throwing over grass or pads the braid stays on top and is visible, letting me see a lot of bites that I don't feel due to the muk, The flouro leader helps the bait sink, but doesn't drag my whole line down with it. This lets me target specific "holes" in the pads or grass without my whole line getting mixed up in it. I can hit a hole and my bait will sink down into it slowly while my braid stays more or less higher up.
I also feel like I can keep a little more slack in the line when I want to with the braid,flouro leader combo which lets me work the bait more effectively for a lot of presentations. My favorite is a weightless soft plastic on a smallish light wire EWG hook on a four to six foot leader with braid main line. I thinks this gives an awesome presentation to a trick worm or fluke while letting me see the line on the water. I don't worry about it because the flouro is all the fish is really around. This is my favorite spinning setup.
Also, as a side benefit, if I do get hung up real bad and have to break off, the leader breaks and this lets me keep the majority of my main line. I just carry around a small spool of flouro and retie a new leader on. Albright knot with a drop of super glue is what I use. Always wrap the braid, not the flouro.