The great thing is not a single new guy has been bad. Upshall, Gomez, Brouwer, Parayko, Edmundson and Brodziak have all been very good. Yes it's early but that's promising and makes it hard to just pick one.
I think it depends on the type of game that will determine who is the "best". Obviously Parayko and Brouwer are the most impactful from that list, but for example, I really liked having Joel Edmundson in a game like yesterday's. He's exactly what we needed.
I always wanted to sign Upshall but the Gomez signing looks even better right now, which I'll gladly be wrong about. All that's doing is giving us more depth while we still have Rattie and others in Chicago.