second way better " im a heart surgeon im ok at it but i can tell you about black holes and philosophy while you are being kept alive by an external pump"
I think an expert in one single particular field is the better option.
In terms of getting a job the 2nd is better imo,I dont think most employers care about what you know outside of your job
The trade-off that you describe does not exist.
It is impossible to be the best at something and a complete retard in everything else.
If you want to become the best at something, you need to optimize so many things about how you work on stuff that you will automatically become really good at other things.
A good athlete knows a lot about sleep, nutrition, leading his teammates other workout, marketing himself and perhaps even psychology and philosophy.
A good scientist is sick in maths, but also good at writing and giving talks. Further they must know how to strategize and convince others. They must know all the other fields that can be connected to theirs, because that is basically the secret to stay on the top. Someone who is the best at a discipline like this is so efficient and has had to internalize so many concept that they could easily ace some other university degree. So that already makes them "above-average" in everything else.
Generally it is advisable to try to become really good at one thing, but that includes exploring everything that is closely related. Say you want to be really good at play just one RPG. Obviously, you will become a really good shooter/aimer too, if there is bows in this game.
You need specialized experts to push science and medicine forward but you also need generally intelligent and critically thinking citizens in order to keep society running. A great example of having a society fail because of lack of general education is the usa. If more people were educated, we wouldn't be this right wing trump supporting christian cultist red neck shit hole we are currently. On the other hand usa has achieved a great percentage of humanitys greatest achievements in sciences and medicine.
depends on the subject you're workin in i think