サラリーマンをやるなら鶏口になるより牛後になったほうがいい

There is an old saying that goes better to be a big fish in a small pond than a small fish in a big pond. This proverb does not apply to job hunting in Japan. If you can get into a large company, you should join a large company. There is no need to go all the way to small and medium-sized companies.