The two superstars have been going head-to-head for the past decade, both for individual awards and team honours.
While the debate will rage on for many years, Lampard has decided to go with the Argentine based on his natural talent
"I'm going to go Messi on this on pure, natural talent, but what Ronaldo has done has been absolutely incredible," Lampard said in a Q A with Hyundai.
He then revealed some of the toughest players he had to face during his playing days.
"The two that I name when I say against is Xavi and (Andres) Iniesta at Barcelona.
"They were great players, they were kind of not the biggest and quite slight. It just shows it doesn't matter, because sometimes people think you have to be huge to be a footballer player. You don't."