Couples prefer bubbles by a 3 to 1 margin over rice or bird seed. Why? Less mess, less cleanup, and bubbles don't run afoul of increasingly tight venue restrictions. (A number of venues prohibit rice and bird seed in their contracts - they don't want to clean it up or avoid hungry birds later.)
Plus bubbles are a lot less likely to end up in your hair, your gown, or your eyes. And from our point of view they tend to make for better exit photos.
