Have you noticed any differences between provincial and national for both OS and BS while you were there?
Cheers
That's such a hard question actually. Objectively: weight. National versions tend to be lighter. Few years ago I played with H3N national on both sides. While the national H3N 37 deg felt faster than any other H3N 37 OS I tried ever since the 40deg BS national felt pretty much the same as any other H3 BS prov. Is OS national better or I was just lucky? Dunno.
I did have a H3 BS prov that started to slip the ball quite bad but that might have been to being old and 38 degrees in Guangzhou over 9000% humidity could have made it shit out its last breaths. I haven't tried any of the "Star" versions or the player name versions.
It's also hard to get a good read of others rackets. One has silver Viscaria, other Fan Zhendong ALC, the next Lin Gaoyuan and so on. How heavy are those I wonder. When did they boost? How did they boost? I might like one combination over the other and it might incidentally be national H3 BS. Which would be the worst case since now in my mind the national BS is soooo much better.
My last H3 BS prov for example had a small imperfection on the topsheet, like it was poked with a needle or something. I could see a small "hole" on the topsheet but it was in a non playing area. Maybe that was the reason it got to be prov and not national. I gave my racket to some former provincial players who coached me and they said it's very good.
I think BS prov is already very good. From OS I would maybe venture in the national territory and usually OS national is in the same price range as BS prov and that few grams also might make a difference for someone especially if you have a heavy wood. (90+ grams)
So hard question and I can't even answer it in a thousand words in all honesty.