So you are referring to this one?
https://meta.discourse.org/t/the-cheapest-solution-for-hosting/24060/44?u=ljpp
So roughly guesstimating, the dedi-server Skylake cores are about +66% faster than UpCloud cores (the best reported VPS performance), and you get the benefits of more RAM per $.
What kind of buffer and unicorn numbers would you apply for this kind of Hetzner server, Skylake i7 quad-core with 32GB RAM?
And trust me - the day I need to scale horizontally is the day I click the buy button at Discourse.org.