For a typical person all should be same though RTL9210/B seems to be the most used/popular version so prefer RTL9210 (B or without B).I read a random YouTube comment saying the RTL9210B is not as good (?) as the RTL9210. Other comments elsewhere say the RTL9210 is very good, perhaps the best (vs JMS583 or ASM3262).
if its possible - I found StarTech PCIE adapter replica on Amazon - https://www.amazon.in/dp/B0DBQJYGNBstuck with PCIe adapters.