That depends on where you convert your customers. The Facebook Network which includes; The Facebook website and Apps – Messenger and Facebook App. Instagram App The two WhatsApp Apps A boosted post allows you to grow your business within this Facebook ecosystem. For instance, you can add a WhatsApp button to your post and boost it for people to send you message directly on WhatsApp. On the other hand, Ad campaigns can take your business beyond the Facebook ecosystem. Your Ads can be shown on websites and Apps Facebook has publishing partnership with. This is very useful in remarketing – when you need to chase interested people around with irresistible offers. Boosted post are great for small business owners who can’t afford Facebook Ad specialists and find the Ad manager difficult to use. However, if you want more, try mastering the use of Facebook Ad Manager in setting up your Ads or just hire a Facebook Ad expert ;)