Fat Ronaldo completely redefined the role of a striker and marked the begin of new generation of number nine. He never hesitated to drop deep, starting his runs from his own half to get the ball, something was unseen before for a striker. His stats at Eindhoven, Barca and his first season at Inter were absolutely out of this world at that time and even now for most of the strikers. He was a monster, combining pace, technique, clinical finishing and an incredible sense for goals. At his peak, he was able to take on 4-5 players without breaking a sweat.
Inter Milan was a bad career choice for a player of his caliber (he went there for the money). They were in turmoil and finished 7th the season before he joined them and Milan and especially Juventus were flying too high. They still jumped to the third place after that and finished 2nd the season after. During his time there he raked up a Ballon d'Or (1997), a UEFA Cup, the Serie A Golden Boot and 2 Copa America, as well as the Player of the Tournament Award in the WC 1998 while playing for Brazil.
Then two bad knee injuries, he missed almost two whole seasons at Inter, but still came back for the WC 2002, where he was immense, scoring against every opponent but England, and received the Golden Boot. He came to Real Madrid just after they won the CL, which was the peak of the Galacticos policy and which would soon show its limits. It didn't prevent him to win a second Ballon d'Or, La Liga, the Intercontinental Supercup, the Golden Boot and a Supercup. After that it went downhill, he wasn't the same anymore, not only due to his previous knee injuries but also because of his lifestyle, a certain laziness and a natural tendency to gain weight. His injuries became more frequent, he lost his pace, became overweight and his professional career was pretty much over.
I respect and admire CR7. He's one of the greatest footballers, his rivalry with Messi will stay in football history. He's an immense athlete, a consummate professional who took self-dedication and physical preparation to another level. His career, his consistency at the highest level and his extraordinary stats speak for themselves, and won't equalled for a very long time, if ever. Not only that, he's extremely intelligent when it comes to his career choices, his investments outside the footballing world and the branding/management of his image. Fat Ronaldo was light-years behind in that matter.
However, and having seen them both play, I do personally think that when it comes to the beautiful game and talent wise, there's no contest. Fat Ronaldo did things with a ball, moved me in ways the Christiano never, ever did and that's not something that can be explained with stats, xG, or number of trophies.