Another really important factor here is workload size. If you NEED massive, parallel compute 1 hour a day, public cloud is probably your best option. But if yo

Another really important factor here is workload size. If you NEED massive, parallel compute 1 hour a day, public cloud is probably your best option. But if you can break that up and batch process it over 24h, and you don't have a need to scale up and down, a VPS from OVH is going to give you almost an order of magnitude lower cost than Azure, AWS, and GCP will for a box running 24h/day. What $5/mo gets you on OVH will run you close to $50/mo running 24/7 in a public cloud.