A:
Too difficult to tell. I have Spro's, Tru-Tungstens, Ribbits, Bigfoots (variations of this too), and even a Snag-Proof. I've got strikes on all of these. Even the ones I didn't think would.
That being said, I found that the Ribbits have enticed as many strikes as the Bigfoots and the Spro's and Tru-Tungstens are going to be a real hit.
My advice is to get a variation depending on your budget because there are times when one lure outfishes the other. It just happens.
As far as durability, the Spro and Tru-Tungsten the whole way. The BigFoots feet usually get ripped out or off. The Ribbits fall apart easily after a few strikes. The Spro and Tru-Tungsten do not.