Which medical speciality has the best ratio between how wast and deep it is?

Hope this isnt a bad forum, atleast not somehow extremely bad. Now to the question, maybe it is caused by lack of info but I do have a feeling that with med speciality you can go either really deep on a small scale or you have a broad but not so deep playfield. This question can be something equal to whos the smartest doc in the hospital. Or which speciality has the biggest chance to be the go to guy when noone else know. But I sense that asking for smarts is not good since every speciality... Which medical speciality has the best ratio between how wast and deep it is?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums