If you're getting a Windows machine, beware of some of the 'mini-laptops' or netbooks. Most of them have very small (usually solid-state) hard drives and limited RAM. A friend bought one and it will now not accept the latest Windows upgrade due to lack of space. They're cheap for a reason!
If you plan to do any serious work on it, I would go for a proper laptop every time. As said by others, netbooks and chromebooks are really just used as terminals to access online software in the 'cloud' (i.e. someone else's computer)
Mike.