Pompey is better than Gose by a wide margin.
Gose probably has the better arm, and could be a bit better defensively. Offensively, Pompey is in a different stratosphere. Watch his at bats from today's game and google his in game videos. Compare his approach to Gose's and you won't need to ever wonder again. His FSL numbers and BB% and low K% don't lie. Let's see how he adjusts to AA, which he seems to be coming around.
I'm 100% convinced if you threw Pompey in the MLB right now,he'd be an overall better player than Gose.