Netcup VPS vs root server

From before, I have this server with double disk space: VPS 1000 G11 12M iv at netcup

But transcoding videos is very slow with the 4 CPUs.

Therefore, I’m wondering if anyone has any opinion on what will work best out of the following options? It’s nice with a lot of disc space, but will 6 dedicated CPUs be better than 8 not dedicated CPUs?

VPS

  • 8 vCores (x86)

  • 16 GB ECC RAM

  • 1024 GB SSD (instead of 512 GB)

Root server

  • 6 vCores (dedicated)

  • 16 GB DDR4 ECC RAM

  • 640 GB SSD (instead of 320 GB)