Jose Fernandez has been stunning to watch this year for the Marlins, posting an 8-5 record with a 2.54 ERA. Playing on a Marlins team that is the worst in the NL and having a winning record is quite impressive. Especially after you state that Fernandez is the only Marlins pitcher with a winning record. And get this, he's only 20 years old. Being a rookie pitcher in the MLB is tough enough, but being as dominant as Fernandez? That's even tougher. Even for a veteran.
Fernandez: 8-5, 2.54 ERA, 1.01 WHIP
Miller: 11-7, 2.89 ERA, 1.12 WHIP
Both pitchers are definitely very good pitchers, and you don't need stats to prove that. But, honestly I believe that Fernandez is a more commanding pitcher than Shelby Miller.