The only objective measurement of how entertaining a sport is is its audience reach. Football is unparalleled as far as that is concerned. Baseball is not huge in Latin America at all. AFAIK, it is only big in Cuba, Mexico, Venezuela and a few other countries (located mainly in Central America). It's not big in Brazil and Argentina. I don't think it could even be called a fringe sport in these countries, it's below that. Claiming that baseball's popularity extends to South America is just factually incorrect.