Doing some of both is a good idea, but the proportion of each will be related to the final outcome. The correct proportions of each will lead to a well rounded person. Well, that will very with each individual.
Many people learn by trial and error.
Some people just seem to have a plan worked out that is best for them. Some people never do learn the appropriate proportions of each, or learn them at a later stage in life. Anyway, I hope that you are understanding that there are tradeoffs that we must confront, and some of those are confronted on a daily basis. Production Possibilities a. You are a well rounded person.