As far as overall nutritional value goes, tomatoes are the same whether they are eaten cooked or raw. The only difference you will find when it comes to nutrition is that with cooked tomatoes, the vitamin C content does decrease and evaporate with the cooking process.
You will find that whether you eat a tomato raw or cooked, it is going to provide you with the same nutrients which your body needs to stay healthy and function properly. Despite what many people think, cooking tomatoes does not release the lycopene in them. It is the body heat when they are ingested which is able to release the lycopene.