As much as I hate the Demon Maws I actually went with rotating saw blades. Well, specifically the "clock" variety (one bigger but slow one and the little one connected at the same base).
One of the early Cotton Alley stages had that corridor with them and it took forever to get, I would always just hit that one spot because my timing was off. And a few other levels would always get me because I didn't account for both saws. At least with the demon heads I felt like there was only a small (but annoying) set of levels where they pissed me off.