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SSDs offer a much higher read and write (IO) performance when compared with regular hard drives. This allows for increased performance when all things are equal as compared to a VPS which sits on top of a standard SATA hard drive.
A KVM VPS is like a dedicated server within a physical dedicated server. OpenVZ shares resources with every other client on the host node and is considered container based virtualization. You should choose what is right for you based upon your needs. If you need help deciding, ask someone from our sales team and we'd be glad to point you in the right direction.