And the trap/skeet pros don't typically shoot heavy recoil shells/guns. I can understand why a soft recoil pad might be effective on a gun with moderate recoil. But competitive shotgun sports is not African hunting. Most of us don't go after those animals with light recoiling rifles. Also, competitive shooters tend to use their sponsors' equipment. Doesn't necessarily mean it's the best equipment.
At the club I have yet to see a shotgun with a factory installed Limbsaver recoil pad. All the Browning O/Us I've handled have Pachmayer pads. They are labeled Browning but Pachmayer is clearly the manufacturer. I have zero interest in new manufacture rifles now but back in the days when I did, I don't recall handling any that were outfitted from the factory with Limbsaver pads.
Every shot at the trap/skeet range and the Limbsaver slipon would move cockeyed on my shotgun's buttstock. If I didn't manually straighten it, the gun would mount cockeyed on the next shot. The finger smashing is not something I have ever encountered with any other setup. Mind you, I shoot rather heavy range loads of an ounce or ounce and an eighth, though below maximum velocity. However, my auto shotgun is perhaps the heaviest twelve gauge ever made (31" barrel Browning A5 Magnum Twelve circa 1961) so recoil is not severe (I have a history of retina issues), but obviously too severe for Limbsaver. Occasionally I will shoot a round or two with my Citori and the difference in recoil is definitely noticable. On rainy days at the range I'll dust off my old 870 goose gun with factory Remington black plastic and wonder how I tolerated that recoil for nearly forty years. It originally came from the factory with wood and "White Line" Pachmayer recoil pad, though I don't think Limbsaver was in business in 1968. The plastic setup was added fairly recently after second wood buttstock broke. It's factory recoil pad is clearly not Limbsaver. Not distinctively Pachmayer either though about the same stiffness. Neither of those guns with stiffer recoil pads and wearing Pachmayer slipon have ever bashed my index finger.
I use a slipon because I need a long LOP ... unless wearing a lot of layers hunting in cold conditions when it's removed. Because I shoot skeet/clays low gun it's important that my shotgun fit me (cosmetics are immaterial). Pachmayer slipon Decelerator does have one drawback: their handy easy on/off design. I lost three of them in four years hunting pheasants. They make a cheaper model now with same recoil absorption but conventional sidewalls and I've had good luck with it (but they are hard to find). Also, the fancy Decelerator slipon pads have a hard rubber tip at the top of the pad to help keep them from getting caught in clothing during quick mount. I like the idea but one needs to be aware the butt is slippery if the gun is stood upright on a hard surface.
Limbsaver are definitely more available than Pachmayer. Personally, I think it has more to do with marketing tactics than product effectiveness. "Limbsaver" and "Kickeze" are catchy names. Pachmayer conveys nothing in the name. Haven't done any price comparisons but I suspect Limbsaver may also be cheaper than Pachmayer.