All of those risers are made by the same factory from the same product line, you will do well with any of them, the specifics of your deployment and power setup will dictate which kind you use.
Do you mean this ITHOO? But there are also other brand (for example I had also OLIKE, egomall etc.) Or all comes from one OEMs?
There are many suppliers in Shenzen and almost everyone says "I am the manufacturer" and show pictures their mounting halls.
Maybe they are buying only PCBs and they are mounting only other components/connectors.
I will order this month big quantity (several thousands). Last month I ordered from Shenzen C.X.T technology V006S, and I am not sure if they are really manufacturer. For next order I will need better price, so I am looking for primary source.