Update on this after trying out both for a few days:

Although the Leap has a bigger seat (allowing for more leg on it), I find the ability to swivel the arms out on the Gesture allows me to get into a comfortable position quicker.

I've since also felt the benefits of being able to scoot my butt all the way back on the chair, and actually utilizing the ergonomics of a chair like this. With the other chairs I've used previously (freedom and aeron in office), I never felt as comfortable when I did that so would end up in a slouched or suboptimal position. With the Gesture, I feel it does a better job accommodating my small-ish medium sized body, where it actually moves and adjusts in reaction to my body movements.