I love the Quai on you! I think of it as a short version of the Madame, but better! Why better?
Because the Quai has set in sleeves, which I love. The Madame has oversized batsleeves (e.g. Kimono), and it can make the shoulders look droopy. To add to the oversized sleeves, the Madame has a small lapel, so the look is a round shoulder, tiny head especially when you button it up. The oversized droopy look is the look of that coat though.
The Quai is perfect to me. It has set in sleeves which gives the coat a nice structure and makes a person look taller with a more tailored shape. In addition, the Quai has a large lapel which I totally love beause it highlights the face. I think a large lapel looks fabulous when a coat is closed.
On the Rialto...
The Rialto is a coat I totally love in terms of it's design. I love love love the integrated hood and lapel, meaning the hood is part of the lapel. Unfortunately, to me, that is also its downside. The Rialto is super fun coat when you wear it with the hood on. However, when the hood is off, I feel the hood's weight wants to keep pulling the lapel back as it is the same piece. For the short time I was wearing it trying it on, I felt I constantly had to adjust and pull the lapel back down. Last thing on Rialto, I felt like it was a lot of fabric. As much as I love the integrated hood and lapel, I felt it added so much fabric to my upper body.
Back to the Quai...
I think it's beautiful on you. You have nice shoulders, and the set in sleeves accent your shoulders. Add to the set in sleeevs is the wonderful large lapel. The lapel looks great against your upper body and frames your face, making my eye want to move up to see your face. I also love how the double-breasted buttons and the angle pockets give it character. It is loose, but it is a structured tailored loose look which is a look I love. An added benefit is that it is cashmere, top quality.
I vote for the Quai. I also love the camel color on you. It's gorgeous, especially against your blond hair. You look like a classic beauty.
I know I sound so biased against the Arona, and I have not even seen the Arona modeled with real photos.
I can visualize it though. The look will be more loose (e.g. kind of floppy as it is not line), lightweight, and casual. The 3/4 sleeves though will bug me, that I know for sure.
The Arona will not look as structured and elegant as the Quai. However, you may be looking for something lightweight and casual like the Arona though and love it.
Now I can't wait to hear what you think of the Arona.

Whew... sorry for the long response. I hope some of it was helpful.