Professional teacher or informal tutor?

The most asked question related to learning of a language is how is better: to learn professionally or to learn from speaking? These are the two possibilities if want to study through italki site for example.You can contact  a professional teacher which is more expensive or just an informal tutor, a passionate which hasn`t an organized method of teaching a language but is a a native a or a very good speaker of that language.I prefer to start with an organized method of teaching a language but I recognize is`s not enough. More, if I think how I`ve learnt English I realize watching subtitled films, speaking with foreigners and lastly reading and interacting on internet were the means which brought me to fluency. So my conclusion is an initially basic organized approach followed by a lot of interactivity with real life situations related to that language.

So if you want to really progress with the help of language learning site like italki for example you either choose professional and informal tutors, either find someone  who  can do it in  both ways.