Football fans always love to compare between great players. Why only football? It applies to sports in general. Be it Sachin Tendulkar vs Brain Lara in cricket, Roger Federer vs Rafael Nadal in tennis or may be Muhammad Ali vs Joe Frazier in boxing, fans always love to compare between the greats.
The same applies for Lionel Messi and Cristiano Ronaldo, arguably the two greatest footballers of modern era. Both are extremely talented. Both are highly successful. And the fact, they play for Barcelona and Real Madrid, two of the biggest sporting rival institutions, make this rivalry all the more fascinating.