I think Joker hates playing Andy to be honest and Id say when they play on hard court Joker is only a slight favourite say 55-45. Andy is pretty much nailed on to beat him on grass and to lose to him on the dirt. Thing is though its Joker's consistency throughout the year that is so much better than Andy's. Andy blows hot and cold throughout the year and that's why he's never really come close to finishing above the Joker.
If its a fast HC then it should be 55-45 to Andy.
On slower surfaces Novak is the tougher opponent.
Having said that Novak has beaten Andy in Shanghai (although he served for it) and has almost lost to him in Rome.
Andy has blown hot and cold due to developmental pains.
ie the switch from Masters to Slam preparation (at the expense of the masters) the dip in form after very disappointing loses at the AO and so on.
Things should be steadier now as he is a more mature 2 slam winner.
At least consistency and a possible swing for number one should be his next goal.
The Novak Nadal rivalry shall probably be replaced with the Andy Novak one.
And frankly I see Andy having the upper hand on it.
He just seems to have a handle on Novak's game in a way Fedal do not.
And he is still getting better as player.
We have yet to see Andy at his true potential, there has always been something that has prevented that but it will happen at some point, if only for a period.