Is the tea likely to be healthier?

TLDR: The Tea Tavern prioritizes products that are more likely to be healthy, when comparing across options.

The Tea Tavern finds the following to be current situations.

• There are many methods of farming tea.
  • Use of pesticides to prevent being killed by insects
  • Use of fertilizers to improve growth in various areas.
  • (TODO: Find terminology and research) Plants are cut for the purpose of producing more leaves from the plant
    
  • Farming in different elevations
• Depending on what a person is currently drinking, simply moving to tea might be healthier.
  • Tea does not normally include alcohol 
  • pure tea (Camelia Sennesis) does not include sugar
  • caffeine from tea seems to be absorbed by the body differently than other products like coffee (TODO: determine if research exists for this)
    
• There are beliefs about the health of drinking tea (research is needed to prove these are true)
  • Tea is useful for health in some form like "helps with digestion".
  • Has more, less, or equal amounts of caffeine compared to coffee. 
    
• Tea is not always good for people
  
  • Some teas are not stored well, thus get undesirable growths.
  • And different people have different tolerances to the chemicals within tea.
  • Some teas make people sick (there are various possibilities for this).

Due to the wide variety of tea that exists, how do we know that a tea will be better for our tavern patrons and local community?