I would say stability. Now, it is not easy for me to define stability or explain how to judge it. But I think stability could be described as, a bow designed such that the riser and limbs perform without any torsional rotation and can propel an arrow forward the exact same way from one shot to the next. I've had plenty of top quality bows and tuned properly, they still would only get me pie plate accuracy on my good shots. I always assumed it was my form and never put any blame on the bows I was shooting. I have a bow now that has amazed me at its ability to deliver the arrow right where I am looking on the occasions that I do my part. It has opened my eyes to just how stable and accurate a bow can be. My advice to anyone comparing bows is to forget about speed. Take the bow that gives you repeatable accuracy, is quiet and gives you the most confidence to make that shot in crunch time. Ask yourself, if someone offered me $1000 if I could hit a coke can at 30 yards with one shot, which bow would I take the shot with? That's the bow you need to hunt with.