I can't really tell a difference between the two. Pack the stem lightly and the draw is very easy on both. If you pack it hard, I think due to the extra length of the Argo stem, it might be more restrictive. Performance wise, I found neither like to be packed hard.
I dropped my Air2 a while back and inquired at Arizer about getting the display or the whole board replaced at my expense. I was surprised to be informed that this was not possible, but if it was still under warranty, they would fix it. As it was two years old, I thought there was no way it was still under warranty. I was a few days past, but told close enough to send it for repair.
I wanted to have a replacement before sending it back and purchased an Argo to try something different. I like the easy menu, replaceable battery and precise heat settings. Like the Air2 it seems to be really well built. I liked almost everything about it, but 2 things really bugged me. One was having my lips on the body itself when taking a hit, and if used heavily, the hits are hot and irritated me. I understand the stealth of the short stem, but I rarely ever have to worry about hiding what I'm doing while vaping.
I found an aftermarket stem that is longer with cooling spikes and a carb hole. I have to say I'm quite surprised at how much more enjoyable
this stem made the experience. No lips touching the body of the Argo, and the hits are so much cooler. The only thing I don't like is the carb hole, it's useless for me. The extended length and spikes do more than enough to cool the vapor, and I really don't need to clear out 2"x 3/8" glass tube. I might try to fill the hole with a drop of epoxy,