I don't think there's much to compare there. Hetzner's servers are a completely different price range. Unless you get a used one here: https://robot.your-server.de/order/market (URL looks suspicious, but it's Hetzner, I promise). These are servers that are fairly old and out-dated and whose users have discontinued their contracts; now they're being auctioned off so Hetzner doesn't have to throw them out. But these, I'd say, are also difficult to compare because of the old hardware vs. the new but low-cost hardware of the scaleway ones.