On pools 4 and 5 backwaters I use a 2 pound mono for most of my fishing. If things get real subtle I may go to the 1 pound on very light jigs
I want a straight line when I am fishing, no coiling or memory loops and most 2 pound lines will straighten with a jig sporting a size 10 or 12 hook. I want a line I can see so I have extra reel spools sporting green solar and some bright orange lines in addition to my standard Vanish. If I get a deeper water bite going I also have spare reel spools with 2 pound Crystal.
Line color I think matters only once in a while when specific natural elements come together and as yet I haven’t figured out what those are so I just go to the ice prepared.
I prefer a soft line over a stiff line. I look at stiff line in two ways: you either are using a line that is too heavy or you are using a line that is cheaply formula’d. Most stiff lines are the latter.