I like the clamshells when I do embeds for kids (ex: gold fish, erasers etc), they are easy to work with and displays very nice. I like different designs on molds. So I like both, depending on what I'm working on. I don't leave my M&P soap out. I don't want prints on them (esp. clear ) or people handling and not buying. Most of mine are in cello bags they can open and sniff if they want.