A little better for long term stability, less hygroscopic, been used for anti-rad for a longer time (Iodide pills were much harder to find than Iodate pills when I made my purchase, and I didn't want to have to deal with the crystalline iodide in an emergency situation). I immagine that either will work just as well. The idea, as I understand it, is to load the thyroid with iodine to the max so that it will not absorb radioactive iodine in a nuclear emergency situation.
Thanks:)
PaMom
Another way to load up the thyroid with iodine, inexpensively, is to start taking one drop a day of Lugol's solution of iodine (which is very cheap). This helps offset the iodine deficiency many Americans experience now that we eat less (iodized) salt. A drop a day can be taken indefinitely by those not allergic to iodine, and may also serve to prevent some cancers, including breast cancer. It does not reverse breast cancer, but it can prevent those cells that are pre-cancerous from developing into cancer. It may also help prevent prostate cancer.