>英語教育者としてはTOEICかTOEFLどちらの英語を身に付けるのが良いでしょうか?
Since you are wishing to become an academic professional, TOEFL will be more desirable to you. But, it's really challenging. You need to build your vocabulary, do the readings and hone your listening and speaking skills in academic setting. If your English stands at around elementary level (i.e., the Step English semi-2nd or equivalent), I think you should start with watching the NHK's English language programs/bilingual news and practicing speaking and writing on a regular basis. Then, plan to take the TOEIC once a year or two. If you get a score of 800 or above, you can switch to TOEFL or other English exams. It's a long and winding process. You may hit a bumpy road somewhere in your journey, but as long as you are committed to your study on a regular basis, you will make a steady progress.
Good Luck.
お礼
回答ありがとうございます。 教師力、そして人間力を磨けるように頑張ります。