I'm not very particular about what strings I use on most of my guitars, but I insist on Elixir Polywebs on my Santa Cruz OM. It's my go-to guitar for playing swing, where string squeak is more of a problem than with the other styles I play. I've tried other strings on it and promptly gone back to Elixirs.

No, Elixirs aren't as bright as uncoated strings, but I don't necessarily want a lot of brightness for what I play on that particular guitar. Mellow and squeak-free works best.