We have a white birdcage and it did develop some green spots, after about 18 months or so. We have our home power washed each year, which includes the birdcage and lanai, so it isn't much of a problem.
We like the white, but I think we'd be just as happy with bronze. You'll want to have your home, lanai and birdcage power washed periodically anyway. It's relatively inexpensive [to have done] and keeps the mold and dirt away.
Good Luck!
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