The way I do this is decide which language I like (just by gut feel) and then come up with reasons why it is good / better than others. I think almost everyone does the same thing, really.
But you can learn about yourself and others by writing down specifically the things you like and don’t like, and reading other people doing the same. With the possibility of liking different things for different reasons in the future. Or just better understanding how to best use the tools you like.