Also in many VPS slices you have a guaranteed amount of compute power but when the others aren't using the CPU you can use more, burstable RAM allocations too,

Also in many VPS slices you have a guaranteed amount of compute power but when the others aren't using the CPU you can use more, burstable RAM allocations too, whereas a dedicated blade trying to compete with a Linode slice will have hard limits. While that doesn't apply to all use cases it's a fairly common one.