This is a pretty interesting infographic I saw, very recently published. The debate is about whether a website owner (or webmaster) should develop an app for mobile phones or a mobile friendly web design.
Personally I believe if you have a portal like website, you might wanna go for an app but if you have a simple website which contains information about your company, you don’t need an app, you only need a mobile website. But this is just a layman’s view. This infographic goes deep into details.