Thank you - now I'm more confused than ever!

The photo clearly shows the H2O bigger in BOTH length and width, while the official listings are as follows:

Clara HD: 159.6 x 110 x 8.35 mm
H2O 2: 129 x 172 x 8.8 mm

The Clara is definitely 159.6 "high", which means there's no way the H2O is 30mm shorter. The photo definitely makes the H2O seem huge in comparison, and I think it means I'll stick with the Clara. But reconciling the photo with the listed dimensions is a challenge.