Srimad Bhagavatam Canto 10, Chapter 79, Text 26

SB 10.79.26

yuvam tulya-balau virau
 he rajan he vrkodara
ekam pranadhikam manye
 utaikam siksayadhikam
 
Translation: 
 
[Lord Balarama said:] King Duryodhana! And Bhima! Listen! You two warriors are equal in fighting prowess. I know that one of you has greater physical power, while the other is better trained in technique.
 
Purport: 
 
Bhima was physically more powerful, but Duryodhana was more advanced in terms of technique.
Srimad Bhagavatam Canto 10, Chapter 79, Text 25
Srimad Bhagavatam Canto 10, Chapter 79, Text 27