Here's the thing - I don't think Urias has 3 plus-plus pitches. I think he has one plus-plus pitch (the change). I think a plus plus breaking ball is hard and late. Urias throws a big slow curve. He throws it about as well as you can throw a slow curve - with excellent control and, most remarkably at his age, exceptional consistency - so maybe it's a + pitch. Probably so. But not ++. Similarly with his fastball, he commands it to both sides of the plate very well, but most of the time it sits around 93-94 without a ton of movement. A ++ fastball is at least a couple miles faster than that or with big movement. His change, however, fades like a mofo. And he paints with all 3.
Comps for Urias are still pretty solid. I'm basically thinking about command and control lefties who had a little more stuff than your average command and control lefty and added in an elite change. Tom Glavine and Johan Santana come immediately to mind. Those are solid comps, one a HOFer and one who was on pace to be a borderline HOFer until injuries derailed his career. Dodgers fans might also put Ryu in the same category, which is probably fair, though he had a little better fastball and a little less change. But we always tend to remember the best-case scenarios since they make the biggest impressions.
If I had to pick a pitching prospect right now to bet on to win 200+ games, I'd take Urias, hands down. But if I had to pick a guy to go to the HOF, I'd still take Giolito. He has much bigger stuff - harder heat, sharper breaking ball. He has more elite potential. I don't know that I'd ever be able to bring myself to trade one for the other if I had either of them - too much to like about each one, and you do tend to get caught up in the prospects of the guy you have.