What factors do you take into consideration before choosing the sports teams you will root for?

I’m looking for answers OTHER than “Oh I support so and so because I’ve lived in that town my whole life” or “cause my parents support it” etc. Do you rationally look through teams, compare some stats, see their playing history etc? If you did that, would you choose the team with the best stats? I’m looking to get an insight to your choosing process here.

For those who might feel that it’s not something they’ve ever thought about since they automatically supported what they were “born into,” what about sports that might not be as popular in your country? For example, Americans that follow soccer, how did you choose your team of choice?