The Savinelli is a factory-made pipe, the Radice is made by hand. The Radice's briar, fit, finish, engineering, and curing will all be a cut (or two) above the Savinelli. I have nothing against Savinelli; they're great pipes. But something that's mass-produced in a factory can't compete with something that's made by hand (regardless of what it is). They're just two different animals.
Also if you have a preference, the Savinelli has a vulcanite stem, the Radice has a lucite stem.