Angelina Jolie v/s Julia Roberts

is it right to compare Julia Roberts with Angelina jolie? I dont think its right to compare both. After seeing the promos of Angelina jolie's latest release "Salt", is Is Angelina Jolie the best bet or should that movie role been given to someone like Hollywood star Julia Roberts?

Just wait to release wait Angelina Jolie's 2009 movie “Salt”, the whole picture will clear afterwords.

Julia Roberts has done many romantic comedies like Pretty Woman and My Best Friend's Wedding , Julia has played all kinds of characters, from lawyers and housewives to fairies. She's probably best known for her roles in The Pelican Brief, Notting Hill, Erin Brockovich, and Duplicity.