They don't play in similar positions so I don't get why it's even being asked?
I think the real question since the takeover but still unanswerable should be Yaya or De Bruyne.
Then the other question should be more along the lines of Rodri vs Fernandinho.
To both it's completely team dependent could Rodri have done what Fernandinho did for us, I'm not sure because Ferny's mobility was much better. Then could Fernandinho have done what Rodri has done these past couple seasons I'm not sure, they're both different players who are suited to different play styles but both held the glue together for important teams in our history.
Same applies to Yaya and De Bruyne you cannot position either player into being better than the other individually or even for their teammates, both played the same role as chief game winning playmaker without one the chance of success for each team collapses.
Yaya's marauding runs were everything we needed his perfect passing dictating tempo was immense that's without the goals, Kev's pinpoint passing and crossing relentless energy and ability to create the non creatable with assists or even goals, both players are completely different despite doing a similar role both being the midfield match winner.
Personally I believe Yaya Toure had the single greatest season any City player has ever had or indeed any midfielder has ever had in the prem era, whereas De Bruyne has been consistently great throughout the years but both are as equally important to our history without one there isn't the other.
Many would argue David Silva was even more important than the two above there's always an opinion, we could be here all day debating it but it's not that important.
Same applies to Rodri and Fernandinho too there's so many players in the future that people will be asking similar questions about, it'll be Phil Foden in the attacking midfielder role in the next 7 or 8 years people will 100% be asking is Phil Foden our greatest ever midfielder if not player depending what he does.
And when people are asking is Phil our best ever midfielder others will shout Yaya for those 4 or 5 immense seasons, others will look back with purest affection for KDB's intensity and quality over a more prolonged period, others will clamour for Merlin David Silva's magical quality on the ball for a decade to allow not only himself but his teammates to excel... Then they'll be some older guys who are adamant Colin Bell is the greatest that they've ever seen.
I know a rag who says Colin Bell is the best City player they've ever seen, even openly admits Bell was better than any of bacon face's club produced midfielders.
These questions will always crop up they aren't too important for me I have my favourites, also I respect the history too there's been so many changes to my all-time City XI, I'm sure they'll be many in the future too...
Future thread on here:
Is Ederson our greatest ever keeper? Many will say how can he ever surpass Bert Trautmann's legend, many will say Joe Corrigan is our greatest ever keeper consistency wise.
Some will love Joe Hart's contribution to our post takeover success, while some will admit Tony Coton was better than Hart whilst hating him for joining the rags. If any are interested in football history they might rightly throw Frank Swift's name into the mix, they then might argue that not only is he our greatest ever keeper but footballs best pre-WWII goalkeeper.
Comparing is never ending just enjoy the moment... these comparisons aren't that important they're always gonna have a split in opinions, especially when there has been at least 2 world class legends for the club in most positions.