Never used these two so far, but both are top grade for each brand, so I guess it is a matter of price.
Cost Youhe S100 expensive for 2$, but Brand Youhe claims that they produce for Yonex shuttlecocks and Youhe S100 quality corresponds Yonex AS50!
A lot claim to be OEM of Yonex. That's not new and does not mean anything to me. And a lot claim to be correspond to Yonex AS50 and the reality is none to be any close to YYAS50. I have tried top grade of Aeroplane, Victor, RSL, Chaopai, DNA, have not found anything that is closer to Yonex AS50. The only one I found next to AS50 is Aeroplane Black. So, I believe AS50 is AS50, no one else make it. I think Tronex is more famous brand than Youhe. I used Tronex Blue before, which was very good.
I totally agree with you that Tronex more well-known firm and the products this company has good quality, but what is related so much difference in price with Youhe S100?!
By looking at some rating on the internet from a seller ( I don't have any business with the seller but happen to know some feedback about the seller, so I think the seller is not cheating), Youhe S100 = AS-40 = EG1130 Youhe S101 = AS-30 = SG1130 Also seems Youhe is OEM of Yonex only for low end such as AS-03,05. The price is indeed on par with EG1130, so it would be interesting to try some and see what happens.
What is the quality Tronex Gold and so by applicable shuttlecocks as AS-40 and EG1130? I can give you e-mail manager of the company Youhe and you can order test samples! P.S. Youhe S100 worth more 1$ than Aeroplane EG1130.
I regularly use Tronex Gold and they are a very good shuttle. Flight and durability are both very good.
The head for EG1130 is two layers( half soft wood), but the head for S100 is whole natural Portugal soft wood, it effects the cost!