I'm considering using my travel credit for a new carry on, and was debating between these two. I have one rolling carry on, although it's a bit larger than the current model since I've had it for a while. It's the same size as the Ravenna. The Ravenna is about half a pound heavier, which could matter if you're trying to pack really light to meet the weight limits of some European carriers. And it is an inch larger than the rolling carry on. So far, though, I haven't had any problems with size of the rolling carry on when traveling on United or Delta. Will be on Alitalia this fall, and I know they have weight restrictions. The size restrictions, 55cm x 35cm x 9cm, appear to be just about OK for the Ravenna although 35cm is 13.8 inches, and the Ravenna is 14" high. The rolling carry on is definitely within the size limits.
I also can't tell from the photos if it opens book-style or has just a top.
If anyone has thoughts about which might work better for someone allergic to checking bags, I'd love to hear your insights!