I like a regular fillet knife best for lots of reasons but mainly the feel and quality of the results. I have tried both though. Although I don't normally get in a hurry cuz I enjoy cleaning fish, I think I'm fast enough. The first video was good, never seen one done that way but will have to try it. I really wasn't impressed with his speed though. 22 seconds on the other hand is fast! I've always just cut thru the ribs while filleting then remove the skin then slide the blade under the ribs following the contour of the rib cage. Never timed it......got me wondering. Gonna have to go catch some.