CPUs are in the same ballpark. They are all recent generation Intel Xeon with a lot of cores. The providers each have a few different builds, you'd need to provision the machine and check the model number if you want the details.

SoftLayer is a disaster on lower tier servers. You only go to them for higher tiers.

The market is very competitive and moving fast. Both Google Cloud and AWS have been rolling out high memory hardware recently at a reasonable rate.

Hetzner is amateur tier. It's cheap second hands servers with no ECC. It's not comparable to enterprise infrastructure.