It is not about which exchange you prefer, it is about the coins you would like to try and the setup that you have. Some people use trading bots that work there, some people trade things that is not at binance but at kucoin, some people have been using it for a long time and do not want to change, some people are from wherever kucoin is from, some people are too used to it, some people like the design.

There could be a million reason why we could prefer one over the other. I know people who use only the local exchange for example, it has 1% volume that binance has, but it has the chance of putting fiat into crypto there and they prefer it that way. So, I would say that it is clear to me binance is the best but there are a million reasons that you could use something else. Which is why I doubt that people would be really worried about picking.