Selecting the best Pu-Erh Tea
Pu-Erh tea is an oxdized tea.It can be qualified as raw tea and ripe tea according its oxidized process.Raw tea is oxidized in traditional way.
It's oxdized with its own natural bacteria while ripe tea add artificial steps to speed up pu-erh's aging and oxidizing.
So raw tea has a longer aging time and more changes in liquid and flavor.You can consider Pu-Erh Tea as wine that taste better over time.

Health benefits of Pu-Erh Tea
Not only the liquid and flavor,but also the health benefits are different between raw tea and ripe tea.

Raw tea:Raw tea contains more catechins which is known for immunity,skin,cell health,vitality,weight loss.It tends to be lighter and green in color.

Ripe tea: To get ripe tea from raw tea,catechins will transform into another type of polyphenol – known as theaflavins. 
Theaflavins plays role in digestion,heart health and brain health.That leads ripe tea more brown reddish.

Storage of  Pu-Erh Tea
Stable environments at 20-30 degrees Celsius，Dry and ventilated. Though many loose leaf tea should sealed in airtight containers,
Pu-Erh Tea needs fresh air to ferment.Separate raw tea and ripe tea for they are in different taste.