Looks like a lot of fans of Atomics gear on here. I have a swivel on my current second stage that The LDS said they could install on my Legend if I get that, so it takes that aspect out of it. Then its price, service, and of course performance that are what I'm looking at. Price isn't as big a deal since I plan on keeping this reg for quite some time, but it does come down to value. If there is comparable performance at a lower price then its a no brainer.
I did test them out of the water which I know is inaccurate, but it should give some comparison between the two I would think. It's either that, or look at machine readings which could be imperceptible to the average diver. I couldn't imagine too many LDS that let you dive a bunch of regs before only buying one. Maybe I'm wrong? I'm still straddling the fence here since I only know of a few shops that I've noticed Atomics in and a lot more that would service Aqualung. Then again, the two year service interval is nice too in that regard.
Keep the opinions coming and thanks to all for chipping in!