You fuc*king kidding me? I'm playing only Axis 1v1 in last month.
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I still should have a replay.
Problem is I needed PzWerfer as a AI unit but it completly sucked so instead of a Panther I had to get Brummbar as a another AI unit which completly ruined my plans.
Its difficult to determine if you aren't just trolling. Pzw isn't a high value unit on 1vs1. low armor, large cooldown, cost a lot to unlock and then is really limited in its use aka, counter blob. Unless you can catch your opponent full retreating in his base, you're not going to get paid really fast for your investment.
So yes, a Brumbar is most likely to do a better job in 1vs1, even if it is more expensive to build. Brumbar counter blobs and lone units, doesn't have a cooldown, have a high armor and it is definitively a shock unit in the sense of - You need a good damn TD to kill it fast -.
Compared to the Calliope, well as USF, or take the Calliope Doctrine or you take the Buldo doctrine, I guess the difference is there + prices.
Not that I'm against nerfing the calliope, just that I never felt your experience vs it while I'm also playing a lot and exclusively Ostheer lately. I have even lost my USF ranking....