Frankly, I don't use soda or pop. Rather, I use the name of the beverage I am referring to (i.e. Coke, Pepsi, Mountain Dew). Soda and pop are both terms that are too general to be used with ease.

Ex.
"I'd like a pop, please."
"Well, what kind would you like?"

"I'd like a soda, please."
"Well, what kind would you like?"

See? You get a response that further requires you to answer with the specific brand of carbonated beverage.

But, because none of the choices are specific on the poll...

I must vote...

POP!!