Haven't compared them, but that is basically the same question as any other Yamamoto soft plastic vs. the YUM or ZOOM equivalent. Yum & Zoom work pretty well, are tougher, and are dirt cheap. Yamamoto plastic has more action, are remarkably fragile compared to competing plastics, and are more expensive. I used to stick to Yamamoto plastics on the theory that i wanted to pay for the best and I'd rather catch that one extra fish every 25 casts or whatever it might be, but as time has moved on, I've realized I'd rather have a single bag of plastics last me a year or two instead of having to go buy a new $7.00 pack of senkos every two fishing trips.
But I'd guess any feedback you'll get will be the same. You maybe catch more on the GY, but we'll never be sure because tis fishing and you can never directly compare really anything when your success or failure is defined by what got a particular living organism to bite a lime green piece of plastic.