Laptops are a better choice than tablets if you need to do work-related tasks, because they come with an integrated keyboard and trackpad. That makes them much more productive and comfortable to use for work and study.
For instance, if you spent a full day writing reports or essays, creating spreadsheets, or filling in forms, you'd find using a tablet's digital keyboard very slow and tiresome by comparison. The same applies to hardcore gaming: while you can run, say, World of Warcraft on an iPad, it's much more enjoyable when you're using a proper laptop keyboard.