The Portuguese superstar spent six years in total at Manchester United before sealing a move to Madrid in 2009.
He won four Premier League titles, the FA Cup, two League Cups and the Champions League as he developed his game under Sir Alex Ferguson.
And former team-mate Neville believes during the time Ronaldo was picking up trophies for United between 2006 and 2008, that saw him win his first Ballon d’Or, the attacker was in his prime.
Cristiano Ronaldo scored his 100th Champions League goal last night Real Madrid wages revealed: Which stars earn most? Fri, March 24, 2017
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hen he was at United, between 2006 and 2008, I still maintain that's his best two football years as a football player, in terms of his contribution through the whole game.
”I wonder if he's building up for a long career as a centre forward, where his running doesn't have to be 11km, 12km per match, it can be 7km, 8km, 9km, where he can still score two goals and live off moments,” Neville told Sky Sports.
“He's living off moments more than his all-round performance now.
"When he was at United, between 2006 and 2008, I still maintain that's his best two football years as a football player, in terms of his contribution through the whole game.
Cristiano Ronaldo spent six enjoyable years at Manchester United Cristiano Ronaldo statue is savagely trolled online Wed, March 29, 2017
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Cristiano Ronaldo has unveiled a statue of himself outside the airport named in his honour, and Twitter has quickly ripped it to pieces
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Cristiano Ronaldo's statue has been shredded online and even has a Twitter page
"Since he's gone to Real Madrid he's contributed enormously to everything they've done but he's living more off moments rather than a contribution through a whole 90 minutes.
Ronaldo’s success has only increased at Real that has seen him win La Liga, Champions League and Copa Del Rey medals.
He has also added another three Ballon d’Or titles to his collection since his switch to the Spanish capital.