You are a cold type if you always feel cold, your hands and feet are usually cold, generally you like to wear more layers of clothing or warmer clothing to keep warm, and you enjoy hot weather and dislike the cold.
If you are a cold type, tea with warmer properties is better for you.
You are a hot type if you always feel hot, your face is often red, you sweat and often feel hot and bothered, generally you like to wear less layers or light clothing, and you dislike hot weather and don't mind the cold.
If you are a hot type, tea with cooler properties is better for you.
You must also consider age. Younger people have more yang so they can generally drink teas with cold and warm properties. The older you get the more yang you loose (elderly people have slightly lower body temperatures, often dress warmer, and have colder hands and feet). So tea with warmer properties is generally better for older people.
You must also consider sex. Female body temperatures are slightly cooler then that of males. Females are yin- cool. Males are yang- warm. So generally females prefer tea with warmer properties compared to males.