Recommendations for Beginners Learning Korean: 'Talk to Me in Korean' vs 'Vitamin Korean'

Hello! I am a beginner who is just about to start learning Korean. I plan to begin with Hangul and will be using 'Korean Grammar in Use' and 'Ewha Korean'. However, I am struggling to choose an additional textbook to use alongside these materials. I would like to know which textbook, 'Talk to Me in Korean' or 'Vitamin Korean', would complement the others well. I would love to hear advice from those who know the strengths and weaknesses or characteristics of each textbook. I am particularly curious about how these two textbooks can help with learning Hangul and understanding grammar. If you have experience using these books, I would appreciate it if you could share what you liked about them. Additionally, I would like to know if there are any language institutes or study groups in the Gangnam or Hongdae areas of Seoul that use these textbooks. Your advice would be very helpful. Thank you!