Can you tell me the difference between RSZERO Feiying and Riya?

Let’s put it this way, let’s compare 4 brands: Tianying Feiying Riyalinhai board: plastic parts and PP parts including lights are also made of CNSY (Sanyang) (this is a latte art problem, The original latte art made by Riya is the worst. It can’t be peeled off after being coated with varnish. The outer label is 50. Linhai’s and Riya’s latte art are the same, but Lin can still tear them. Besides, Tianying Same as Flying Eagle Latte Art) Engine: This is the most critical thing. You must know that Flying Eagle uses Lin Hai’s machine, and Lin Hai also uses his own machine. What about that Eagle and Riya? The machines they use are made in Taizhou and are relatively rough in workmanship. For example, the middle cylinder, cylinder head, and bowl are relatively easy to anneal (the steel fire is poor). Others: Speaking of the front fork, Feiying has always used the old brand, Lin Huantie. Taiwanese stickers with a 1:1 mark, and Tianying's Riya are relatively inferior. Leaving aside this aside, in terms of rear shock absorbers, Linhai and Feiying's are the same model, and Tianying and Riya's are better. Relatively soft and not very comfortable. In terms of calipers, Feiying and Linhai are also good. Other imitations of Tianying and Riya are too good! Besides, the tires are factory tires. Those who have driven Tianying and Riya must know that the white line slips (at least I have driven them). The other two brands always use factory tires to summarize. In fact, the two most basic factors when buying a car are appearance and engine. The appearance of the four cars is the same, but the engines are produced in different places. Relatively speaking, Lin Hai's workmanship is indeed good except for the box body being a bit brittle, the fan cover making abnormal noise, and the center brace making abnormal noise. (It is made in Taizhou. The RS100 machine is really bad, and the carburetor is rubbish! In this contempt for the black-hearted manufacturer), please add more below. I was tired from peeing after being beaten