For everything that involves producing content, a laptop is going to be more comfortable and more powerful than a tablet. And the new Surface tablet's killer feature is... A keyboard! So you can use it as a laptop. Of course you're going to need a keyboard. Every student out there needs to write essays. Everyone else is writing e-mails, reports and blog posts.
Lastly, the price point of tablets, and their specs, are just awkward. Less than 500 gets you some device with a weak processor, very little RAM, and almost no storage. To get a higher end model you need to pay 700-900. For that price, you can get a very good laptop.