How'd you choose to install your next app?

You have 2 situations: 1. Suppose you saw a great app advertisement that (pretends to) cut down your time by half and increase productivity. Will you try it instantly? 2. You see someone you follow already using it (not a paid promotion). You just find out somehow that person is using it. If I want to make you install my app. Which case should I go for? Why I am asking this question (if you've checked the previous post) is because I am building something with the same model to make apps more discoverable. More you can read at appbaskets.com