I haven't handled an Emerson, but I have tried both an Endura and a Delica with the wave. I didn't like the way either one opened. Neither seemed to catch very well on my pocket. I tried them on work khakis and jeans with the same result.
I have a buddy at work who was gifted an Endura wave when he was a combatives instructor down at Fort Bragg a few years ago. He is very quick with it. He liked the size of the Delica for a lower profile and I got one for him.
My best experience with a pocket catch opener has been with the DPx HEST 2.0. I had one, sold it, missed it and bought another. The first one opened quickly and positively every time I pulled it from the pocket. The current one was used when I got it and it isn't quite there yet. I finally got it sharp enough to suit and will get it loosened up over time.