The Xenons have a blue-ish tint, don't they? They are not purely white--so if you are wanting the Angels to stand out--keep them bright white. The slight difference will make them show up nicely, I would think.
If you were get the Cosmos for the Angels--it might be too much. You could always try both, post some pics and ask people's opinions? That might help--but IMO the whites will look the best for the Angels.
