It just depends on the guitar. Even different brands of phosphor bronze or 80/20 work better than others on some guitars.
My cedar-top Seagull sounds great with 80/20s but squeaks too much. Elixir Polyweb 80/20s fixed that. The slight deadening of sound versus uncoated 80/20 is worth it to lose the squeak.
I thought the Guild D4 would sound great with phosphor bronze. It didn't. It sounded dead with them. I stumbled across some sort of unusual GHS "vintage bronze" that sounded amazing for one pack. I have a hard time finding them easily, though. Elixir 80/20s sound good enough on it now.
The Taylor and Martin sound best with phosphor bronze. The Taylor loves John Pearse strings (and cheap Webstrings -- go figure). The Martin doesn't seem to care too much about brands. It's very happy with Pearse so I just stock up on those.
I don't think about discoloration.