Stephanie, if it's FloorScore certified, you are in good shape. Grout and sealers can cause problems, but my concern with the ceramic is that it's too hard and cold underfoot for a bedroom (even in steamy Louisiana). The engineered hardwood is a great choice.
You might also consider FloorScore certified bamboo flooring -- Teragren is a great brand. Natural bamboo is about 50 percent more stable than red oak flooring, but make sure you buy quality.
For more information:
Check out GreenHomeGuide's green flooring Know How for a buyer's guide and a detailed pros/cons of flooring alternatives.
You should also read Mari Strain's Ask A Pro Q&A, "Can you recommend healthy flooring for a home with kids and pets?" to learn more about hardwood flooring options.