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Tormod is definitely the stronger of the two because black works better with the archetype and zombies have considerably more support that spirits, but you'll realistically play either one in your gravebreak deck, assuming your colors support them
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This can be done if I play Lurrus of the Dream-Den as my companion but want to sideboard a 4-MV card
The last time we've seen Bibarel was in Sn & Moon Unified Minds, which makes me wonder if we'll soon see it appear in the Sword & Shield era.
You can play dorks or mana rocks as you saw the need where as with cards like Planar Cleansing and Akroma's Vengeance you have to be more conservative