The more questions you'll ask your users, the more confusion you will cause. In the book, "Don't Make Me Think", the author makes an excellent point: "When you're creating a site, your job is to get rid of the question marks."

These days, three questions are most common: 1. Visit the Full Site 2. Visit the Mobile Site 3. Download the App

"Hmm... which one should I pick... I'm not sure..."

Besides, it is plain annoying to see this every single time.