I use both, but any more I use PBW for a reasonable soak for most of my vessels (not aluminum) then rinse well and immediately use alternating batches of Iodophor and Star San (not both on one sanitizing pass) to try to stay a step ahead of any bugs. I have become much more conscious about covering "sanitized" vessels with lids, caps, or even a paper towel, foil or plastic wrap while waiting to rack or while racking. The alternating approach seems to give exposure to the simplest, yet widest reach of commercially available, "just add to water" sanitizers.