Should I own both?

Yes, if you are able to own both a Sacred Guardian and Ancestral Node you probably should. Each of these Nodes serves a different purpose in the MojoSphere and each has their own rewards.

Sacred Guardian Nodes have their own reward pool and earn rewards based on their rank on the Sacred Guardian Staking Pyramid. The number of TUSKS Tokens that you stake to your Node determine your level on the pyramid and the rewards that you earn.

Ancestral Nodes are your key to participating in all of the community reward pools and therefore important to own whether or not you also hold a Sacred Guardian Node.