I've used them all. I've settled on the terra cotte pot base. Allows for low and slow and hot and fast. Easy to clean (pull it out, scrape with paint scraper). I drilled a small hole in the bottom of my water pan that lets anything that accumulates there drain out.
Neil -- "Easy Bake Master"
NB Bandera [gone to heaven...conveniently located in Long Island, NY]
Rebel 23, WSM A, WSM B, UDS, Easy Bake Oven
Pork Pistols BBQ
MOINK...It's what's for linner.