12 and 13 are ready! I've run both, and spoke to Alan Hamilton of AIRE in person a couple of weeks ago, and he said you can order one, and they will make it for you. They're not stock boats, so it will take a few weeks, compared to immediate shipment with the stock models. The 13 is almost an exactly scaled down version of the 14, with the good tracking, hull speed and slice involved in that design. The 12 is a whole different animal, because it has 22" tubes. First, it only has one (double layered) air chamber, which reduces weight. Second, it's a surfing machine, and once I got used to moving my boat around differently, I loved it. Because of the reduced hull speed and fatter tubes, I had to use the waves more to move me where I wanted to go (instead of just ferrying under my own power), and had to push over the crests of waves more. Once I adjusted, it was a ton on fun for playing on the Lochsa at 8.5 feet! This is very similar to how the SOTARs I have run responded. This furthers my opinion that the choice of boat is about personal taste, because when I adjust my style, either design works well. Although I prefer AIREs, I recognize that SOTARs are good boats too. Anyone who tells you that one or the other is the ONLY option hasn't spent enough time forming their opinion.
When you ask about maneuverability, do you mean its ability to turn, or its ability to make big moves across a rapid? As described above, the fat tubes run differently than the regular diameter tubes. I have described this many times before on this forum, but I like the way that the WD 14 and 13 slice through the wave without getting penciled in. I have done a lot of things with WDs, and they do not pencil in except in truly vertical drops. Husum Falls on the White Salmon is the only time my WD has penciled in. The WD also has better hull speed, which allows me to make moves all the way across the river if I need to. There is a very slight difference in the turning speed. SOTARs have a little bit of an advantage here. If you're concerned about your ability to turn fast enough to face a wave, the SOTAR will get you there a split second faster. This has never been a problem for me.
Finally, there's the things that aren't debatable: AIRE's warranty, quality control, durability and repairability are superior. Performance is where there is room of debate. And unless you get the single chamber SOTAR tubes, AIREs aren't that much heavier. I choose a couple of pounds of boat weight for peace of mind. Just ask lhowe about how she always asks to have her Sotar padded when she puts her boat on our trailer.