Good question. For me, neither. I hate using a demooner tool also. I must have bought 4 of them on ebay and such before I realized, I just don't like using it.
Mine has a small lip that keeps the shell from falling through.
Actually, its a good question. I guess if someone was carrying their S&W for protection, the full moon clips would be better. However, I guess it really doesn't matter for use around the range.