Jennifer Aniston has made it big in so many ways. Her marriage to Brad Pitt made her part of a power couple. She created the infamous Rachel haircut and was really considered the most popular among the Friends cast. She is beautiful and she was fresh, young and flawless when she started on Friends. I think Aniston has the all round beauty compared to Courtney Cox, who is more of a dark beauty. You have to take into consideration that Cox is some years older than Aniston as well. You can really see the change in them over the 10 years of Friends episodes, but you see a big difference in Courtney Cox due to her being older.