Should I run Y'Shtola, Night's Blessed over Vivi Ornitier in Commander?

The deck has some similarities to Vivi Ornitier, but can be very powerful too. The Commander costs 4 total mana to cast, so it comes out slower than Vivi, but you gain access to black tutors, including Demonic Consultation, which pairs with Thassa's Oracle for an automatic win.

Which Commander would you run?

Vivi Ornitier?

Should I run YShtola, Nights Blessed over Vivi Ornitier in Commander?

Or Y'Shtola, Night's Blessed?

Should I run YShtola, Nights Blessed over Vivi Ornitier in Commander?

Vivi has a built-in mana engine, while Y'shtola is 4 times as cost effective and has a built in card engine.

Should I run Y'Shtola, Night's Blessed over Vivi Ornitier in Commander?
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