I say pop mainly but sometimes soda. This is funny. I use to travel the USA for work and it blew my mind the first couple of times down south when I would order a pop or soda and they would just look at me and not have a clue what I was talking about. Then I would just say "I want a Coke". Then they would ask "What kind of Coke?" It took me a while to figure out what the heck was going on. Then I realized that they call it coke instead of pop or soda.
It's just funny saying "I want a Coke". "What kind of Coke?" "A Coke, Coke" or "Mountain Dew Coke" Funny stuff.