Yeah I’ve been doing the same thing.
I main Germany with 8.3 Ground, but I’ve also been playing 5.7/6.0 Chinese Ground which has been loads of fun.
Germany is my main, but I do play other nations to try different playstyles and to also take a break from a specific nation if need be.
If I had to compare both China and Germany at 5.7/6.0, they’re both great in their own aspects.
It’s kinda hard to give a proper assessment.
Germany is incredibly strong, but German team mates are the bane of my existence, but they focus on long range and sniping at that BR.
Where as in China has the M18, T-34-85s, M36, and the Chinese Bulldog, which that lineup alone allows for either Flanking, Sniping, or Brawling if you want to.
TLDR:
It’s nice to be playing different nations at the same time in order to experience different play styles and recognize weakspots