Mathematically what is better? Featured or basic cavs?

I am trying to figure out how to do the math here and I am sure someone here can help. Let’s say I have 6,000 units. That can buy me 20 featured cavs or 30 basic cavs. Featured cavs have a 19% chance to drop a 5* or 6* while basic cavs have a 12% chance to drop a 5* or 6*.
On a per unit basis, which one has better odds to give me a 5* or 6*?
On a per unit basis, which one has better odds to give me a 5* or 6*?
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Comments
Basic = 200/.12 = 1666.67 units per 5*/6*
Hope that clears things up