Which one is the best?

Via advertisement, you can spread your messages to customers from different channels at different times. Recently ads. channels has been split into 2: Inbound (passive) and outbound (active) marketing. In summary:
Inbound ads. : Catching the customer attention while they are in search to buy. Some examples are targeted outdoor/online messages, search engine optimization (SEO) and social media tools etc. So for inbound ads. İt is critical to catch customer in their search/decission moment.
Outbound ads.: Marketer use Out. Ads. In order to trigger immature consumer needs even if they have no idea about product or their needs.

Thus, Outbound ads. is the best to create need, while inbounds is the best to create sales lead:)