I was glad to experience both methods and i can definitely conclude, that Russian/Soviet Math approach is much better! It gave me the boost to be ahead my Us and EU classmates, helped to adapt to my statistical class during my Bachelor's degree. Highly recommended for every parent to include several methodologies to their child's extra program.
This is so great for those who is afraid to go beyond their comfort zone! The social adaptation is one of the most important living skill, which affects one's quality of life. So by talking to strangers, you definitely gain experience, courage, social adaptation, creativity, your neural connections develop and fire, so so so many benefits!