DB+aMoC+GT: 104628 -319 DPS
TotH+aMoC+GT: 103159 -1469 over DB or 1788 DPS loss over Fervor
Fervor scales better with gear from what I undestand, the DB damage portion doesn't scale as well as the fact that once you get higher Mastery, your AS will do more damage thus increasing the value of Fervor. However, there is still this "soft-cap" at like 3.6k haste, which gives DB addinational tick over its duration. That is not achievable on this tier without sacrificing way too much crit/mastery.
In my opinion, Fervor requires the most skill to use, it is very easy to focus cap with it and so you should really be careful when to use it.
Adding PTR values also, to see how much they affect:
Fervor+aMoC+GT: 109762 (4800 DPS increase compared to Live)
DB+aMoC+GT: 109302 -460 DPS
DB is now even further behind, meaning that Fervor just scales better.