Who is a better singer Selena Gomez or Demi Lovato?

The both of them are now the age of 20 and have starred on Disney channel. They acted together in Barney and Friends, which started in 2002 and ended in 2004.They also acted in Disney's original movie Princess Protection Program premiered in 2009.Selena Gomez and Demi Lovato were best friends until they had this argument in 2010. They have put that behind them, they are not as close, but they still call each other friends.