One page website aim to provide important information about the business/profile using minimum content, as people’s wants to know everything reading minimum content. Generally users make their decision within few seconds that they will stay in the same site or leave it. So one page website is one of the best option for small business. Hope you can also understand that good design also an important part of your website to force visitors to stay in the website.
When you are going to create one page website then you have the area to play on design but in multi pages website its little difficult to work in similar way for every pages. You can also make story line with proper plan in a single page flow that how your website will behave when users will access it in desktop or mobiles.