Refurbish

This is not just Zombify for artifacts (technically the second such card in history), but the cheapest Zombify effect new sets have seen in a long, long time. Turn four is sometimes considered slow by the standards of open-format reanimator decks, but it's pretty fast compared to most decks' gameplans - if you were playing during Ravnica, you might remember Solar Flare, which was nominally a midrange deck but included a couple of copies of Zombify to occasionally take advantage of Compulsive Research's effects. I'm genuinely surprised they put it in the same season as Kaladesh's Gearhulks, but you should definitely take advantage.

Constructed: 4/5
Casual: 5/5
Limited: 4/5
Multiplayer: 4/5
EDH/Commander: 4/5

Refurbish (9/13)

The issue with Refurbish is that it's only going to be as powerful as the best artifact in your graveyard, and there's not a ton of really powerful artifacts running around that would be likely to get smashed. Still, it's a second life for a Vehicle or for part of an artifact combo, and that alone makes it worth consideration in a deck with a high density of them. And it also lets you fish out Equipment, which white does love to play around with.

I guess it also lets you reanimate a Gearhulk, so that's pretty cool.

Constructed: 3
Casual: 4.5
Limited: 4
Multiplayer: 3
Commander: 4