Soda... Television... What's up.... more formal.
Pop... TV... Wassup.... informal.
I say Pop 95% of the time, unless i'm making fun of someone for saying soda.
If someone said, "Hey, let's watch some television" or "Would you like a soda?", I'd think they had social or brain problems, like they don't get out enough.
But if they said... "Let's watch TV and drink some pop".....i'd know they were normal.