I like the Neet PFT tab - the one with the felt spacer and superleather face - for shooting split finger. Nothing better than the BlackWidow tab for 3-under.
I don't care for the calf hair jobbies. The hair starts wearing off, the release gets inconsistent and my accuracy goes to pot. They have to be replaced far more often than regular leather faced tabs... Unless you're in the habit of losing them before you wear them out.
I bet I've lost enough tabs over the years to equal up to a whole cow hide.[&o]