Not sure. They were cheaper than DigitalOcean, to the point where 1 DO instance cost would give you 3 on Hetzner, but now they're at parity, and DO seems to have a better product.
Speaking for myself, I used $5 DO droplets for quite a while when learning but as soon as I switched to real projects and realized how quickly the price ramped up, I moved to Hetzner and the simplicity of their interface was a breath of fresh air. I saved a ton of time after switching. So to me, Hetzner has the superior product.