For base dmg numbers its Tetra. If you use a rotation that uses a lot of power fast its Omega. Neither are Top 5 current Artifacts though.
To realise the full potential of the Omegahedron you need to move it into your inventory, move your curser to it, then press triangle, then X.
Depends on what you use it for. What you pick to use is totally up to you. If you want more power regen, then omega is able to help a bit in that department. If you want to be supportive and add a little burn, use tetra. Both are best all leveled up, unfortunately. Being a healer, omega is awesome. My healer hasn’t drank a soder in a longgggg time. Being a dps, or troll, tetra is awesome. You boost yourself and your partner/group for more might damage. If anyone says that the omega is trash, don’t listen to them. Those people are narrow-meta-sighted on other arts and don’t appreciate what other ones are capable of. Or, they are using omega and don’t want you to use what they are using. Cheers!
Tetrahedron. There's this thing called CYBORG (the ally) now that you should definitely get instead of even thinking about the Omegahedron.
Anyone who disagrees with you is narrow minded blah blah blah. You know nothing about me. I have two healers (water and elec) who don’t run Omegahedron and neither of them use soders either. Not that there’s anything about not using a soder that makes you a better healer. They will be putting out stronger heals than yours, all else being equal. Cheers!