WHich is better for gaming: normal laptop, subnotebook, netbook ...

None of those you listed are the best for gaming. Though gaming computers are mostly desktops which offer better performance, gaming laptops made up of the best laptop components do exist, although they cannot give as much as desktops ... However, you'll want to buy it from a custom computer company that specializes in the high end section of the market, as mass producers such as Dell and HP use stock parts in their computer, the 90% normal production quality parts that ...