Every Splint Boot on the market today, do the same job as the other. All Splint Boots do is protect from knocks and bangs - if you want to get Woof...then fine, but you're buying the name.
Davis splints do just as well as any other splint on the market, at 1/2 the cost. Especially if this is not your horse and you don't want to spend that much money.
If you want to get into a more "advanced" protection for your horses legs, look into boots lined with Neoprene or Sheep Skin. The Neoprene aids in absorbing shock, so does the Sheep Skin.
But splints are splints, they all do the same job.
I actually like the basic Splints I used to use back in Pony Club. I used these for years, from D to C, until SMB's came out.
These are made out of Neoprene, so you got that shock absorbing, and the boot adds extra thickness to where the prime area's are for "knocking and striking".