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Which is the stinker?

C-section. n=1

Wouldn't the other twin be n=1 as well?

I think you were just trying to divide and conquer. It's hard to compete with twins! ;)

Any idea how frequent this (the first naturally, the second via C-section) is ?

Increasingly in developed countries twin births are caesars; the risk profile of twin births often necessitates this for patient safety.

When a normal vaginal delivery is possible (ie first twin cephalic) generally the second will follow. My partner (obgyn Resident ) says she has had 2 twin births where the first was vaginal and the second Caesar, out of roughly a couple hundred

Well, it would seem that when it does happen it’s a 50/50 split