I view a rimfire can much differently than centerfire rifle cans. For centefire rifle cans, unless you're shooting subsonic ammo, it's still not "quiet." So, the factors become size, weight, and cost. For rimfire cans, however, they actually are quiet. With that understanding, I would rearrange my order of preference to:
1. Quiet (including FRP concerns)
2. Light
3. Short
4. Price
I currently have one rimfire can, an AAC Element 2 that I purchased new back in 2013. I like it a lot. I don't shoot a lot of volume throught it. I treat it as a utility item for property pest elimination along with the occasional fun outing for the kids. I have multiple rimfire hosts and at this point am looking to purchase at least one additional rimfire can. In shopping it appears that nothing exceeds or even matches the Element 2 in terms of performance. Even Kevin's (who brought the Element 2 to market with AAC) Q El Camino is longer and heavier than the Element 2.
The closest thing seems to be the Mustang (certainly lighter than the Element 2), but I'm a little wary of the aluminum baffles.
What's the real deal?