I miss the 2006-2008 Shanghai surface there. I have no doubt if they kept it at that speed Fed probably would’ve won 1-2 more titles in 2012/2014/2015/2017.Of course Djoker was the better player in the 15 WTF. He raised his level in the final (a must win match). A RR loss ( in a non must-win situation) doesn't compare.
As far as overall record is concerned, Fed has 6 YECs+4 finals ...has been relevant from 02-18 (so far) ...only been eliminated in RR once. (08)
Djok has 5 YECs+2 finals ...has been relevant from 08-18 (so far) ....djoko has already been eliminated in RR twice (07 and 11)
fed's peak level is higher (IMO).
only plus point for Novak is his 4 in a row.
Novak was also helped immensely by the slowdown of the YEC in 12-15.