There is no one "Best" life insurance company, it depends on what you are looking for and your medical conditions, age, family health history, and other factors considered by the insurance company when you apply for a policy.
They all have different ways of underwriting the life insurance policy so it depends entirely on you.
You also need to decide whether you want Level Term or Decreasing Term life insurance - is it to cover a mortgage or offer family protection?
How many years do you need life insurance, and what can you afford to pay?
You may want to review a list of top life insurance companies and compare life insurance rates and plans online before choosing the coverage you need.