India Virgin Hair & Brazilian Virgin hair

Many of us would like to buy wig made of India virgin hair or Brazilian hair. And we normally believe that Brazilian hair is in better quality, and wigs made of Brazilian hair are always more expensive than those made of India virgin hair. But honestly, i can't tell clearly about their difference. So could anyone let me know the difference between India virgin hair and Brazilian virgin hair? This problem really has bothered me for a long time. Thanks in advance.