Via Facebook, I asked one of the most relevant questions to our society.
I got 12 comments. 1 didn't answer the question. 2 combined the two words. Alan said "Coke" which was probably the most truthful answer.
Out of the 8 pertinent voters, 3 were Arizonan, and 5 were Michiganders.
The results were:
This is great evidence to a great truth. If you call it "Pop" in Arizona, you're in the minority.