This post is not about statistics or videos to compare these two great midfielders. Rather, I have certain observations regarding these two that I would like to share with you guys and you in turn can correct me in case am wrong.
The only negative observation that people are able to make about Modric(if you consider it to be a negative) is that his goals/assists stats aren't high enough to justify a 40M price tag. But the explanation for this could just be that he plays in a deeper position that requires more defensive contribution also. He is the one who makes the pass that initiates the attack or the transition from defense to attack. It is his vision that identifies the attacker in the best position, his precision in passing that determines the speed of the transition. It is a vital role that could make the difference between a good team and a great team especially when the opposition is good enough and bold enough to play a high line. In the later stages of Champions league, you are likely to face such competition and a CM like Modric is a must.
Having said all that, I don't think Modric is combative enough to play as the lone DM in a 4-3-3. Italy (and now Juventus) play Pirlo as the deepest midfielder, but in those cases the midfield is a diamond and the two wide midfielders are actually expected to help out defensively and also cover for Pirlo if he wanders forward. I am discussing a 4-3-3 because I think it is safe to assume that is what AVB will have Tottenham playing. Since DM is ruled out for Modric, he will have to play as a box to box midfielder who plays a greater role in the attack. While we can be sure that Modric is capable of this adaptation, it is safe to assume that AVB won't be disappointed to have Moutinho play this role instead of Modric. Moutinho played in a 4-3-3 in AVB's Porto as well as in the Portugal team at the Euros and he always does a damn good job in this position. If we pay 40-45M for Modric, Spurs should definitely be able to get Moutinho for 30-35M.
Also, we know for sure that RDM is going to play a 4-2-3-1 at Chelsea and Modric's best position seems to be in the pivot. Considering all this, I think AVB's appointment as Spurs manager may actually make the Modric transfer likelier. Maybe I am making up stuff just to convince myself that we will finally get Modric and that is why I am reaching out to your opinions on this. It is also being rumoured that AVB has identified some Brazilian player as a replacement for Modric and hence we may not even have to depend on Spurs getting Moutinho. One thing is for sure - Chelsea can't buy Moutinho to play in the pivot because he goes forward very frequently and is more suited for a 4-3-3.