Got asked to drop a vote on this, and after a few listens, I can't come up with a winner. I'm sorry. So here's some of my impressions that led me to that conclusion.
Pigpen: Pigpen has a slow lazy flow, and that's not necessarily something I'm going to punish him for. it's his style. It's casual and smooth and I don't have a problem with it. He switches up his cadence a good amount and is substantially more entertaining than most from his presentation alone. The problem in this battle was definitely his motivation. The fat punches went long, but they were clever. The flips were clever.
Vinstigator: Basically, Vince's strengths were Pigpen's weaknesses, but vice versa as well. Vinstigator has a solid flow and rode the beat well and put some genuine emotion into his delivery. The punches need to be more creative. I appreciate and give credit to all the rebuttal attempts, but they need to be more clever than just, "fat jokes were weak". Use some wordplay and your content will really be solid.
That being said, Pigpen wins on content, but Vince was punching more. Vince wins on flow, but Pigpen varied cadence more. I'm stumped.