OctoPack vs nuget.exe - Which one is faster?

I'm currently trying to speed up the build of Team City.

After the successful msbuild step, we will package our solution using nuget.exe and then publish it to a nudger feed to allow Octopus Deploy to do this.

Now I am at the stage when the step of the nuget package takes ~ 4 minutes (we have a large amount of assets), and the step of publishing nuget takes ~ 30 seconds. This takes about 75% of our total build time, so any time I can shave it off, there will be good progress.

I was wondering if anyone has experience with OctoPack and nuget.exe, and I can say that if one of the two methods is faster than the other? No hard numbers are required, a simple enough proof.