Well, both 5... Qb6 and 5...Bd7 have good engine evaluations but stats say in favour of 5...Bd7. 
Statistical evaluation ev(Bd7)=0 while ev(Qb6)=+0.2 is in white's favour (according to the local Explorer's database).
N.B. U can find the definition of statistical evaluation here:
https://www.chess.com/forum/view/chess-openings/statistical-sharpness-and-evaluation
I play 5...Bd7 and that is how GM Simon Williams plays it and recommends in his book, Attacking Chess The French. Not too mention the mistake i see almost every other day from 1500 and under opponents: 6.Bb5? Nxe5.
6Bd3 is not that good as 6cxd4 7cxd4 Bd7. If White now castles then play enters the Milner-Barry gambit, which is considered quite good for Black. Alternatively, if White reacts to the threat on d4 by moving their Bishop to c2 then Black plays Nb4 and Whites best minor piece is threatened. If White tries to preserve the Bishop with Bb3 or Ba4 then Black plays Qa6 with the devasting Nd3 to follow. Hence, White best option is to allow the Knight to take the Bishop on c2 and thus Black reaches easy equality.
5...Qb6 is more aggressive and more to the point. But really, both Qb6 and Bd7 moves are a part of the main line, and there is no immediate way for white to exploit black's passivity, so it is likely that either move will lead to the same position, just after a different move order.
A player wishing to play the Qb6 variations could consider playing it on move 4 instead, because doing so stops all sub-variations with Be3.
I back Noah on this one, I would like to know why Moskalenko "blames" the Bd7 move.
@verylate I don't know if 6...f6 to attack the head of the pawns-chain (e5) is sound here. What about the "usual" development putting pressure on d4 after ...Bd7 (e.g: ...Nc6, ...Nge7, ...Nf5, ...Qb)?
If you don't want to give White an initiative then don't accept the gambit with 10...Qxe5. The point of 9...Qc7 is not simply to nab a pawn but to allow you to castle long.
IMO 4. Nf3 is the only truly annoying Exchange line, as 4. Bd3 c5!? gives Black good play in the resulting IQP positions. Check out post #7433 here for a model miniature in the 4... c5!? line:
https://www.chess.com/forum/view/game-showcase/post-your-best-miniatures-here?page=372
While out of topic, I personally don't find the Exchange line boring or annoying at all. It's equalised and quite easy play for black, and he can adopt many setups depending on what white does.
@edguitarock Far from the usual cliché, the exchange variation is the one where I always play for the kill with Black pieces OTB. Just have a look at how Alekhine played it...
I have been studying the French in the past while and the books and other material that I have are quite divided on how to play against the Advance.
So, my question is: what is the general consensus on the 'Net?