There is not enough statistical data to answer this question properly and without the adequate amount of information (via poll or survey data), any answer would simply be opinion based and not a substantial answer.
shrek
Who is Susan Boyle? Every body in the world knows Garfield, I think he stole my Lasagna once.
lady gaga
Cristiano Ronaldo
Sonic the Hedgehog
They're both just as famous as each other
susan
There is a young rat who resides in egham known as Joe Bonson; Rumour has it he looks more like Susan Boyle than Susan Boyle.
Adele is more famous
adele is more famous and has won more awards
Adele
Adele.