Used when someone is being very selective based on their personal likes and dislikes. At the bakery, you can pick and choose your favorite pastries.
Pro Tip 2/3
Freedom of Choice
Implies that there is freedom to make selections according to one’s personal wishes. When it comes to free time, she likes to pick and choose her activities.
Pro Tip 3/3
Positively Connoted
Mostly used in a positive context, when the ability to choose is seen as a good thing. He's in a position to pick and choose the offers he wants.