The main difference between loose teas and bagged teas is the size of the leaves. That's what effects the resulting cup of tea. Tea leaves contain chemicals and essential oils, which are the basis for the delightful flavor of tea. When the tea leaves are broken up, those oils can evaporate, leaving a dull and tasteless tea. Typical tea bags are filled with the tiniest pieces of broken leaves, called fannings.
Loose teas are typically whole leaves or at least large pieces of leaves and have a much more complex, rounded and full flavour than tea bag teas.
On top of the leaf size, there is also the space factor. Tea leaves need space to swell, expand and unfurl. Good water circulation around the leaves is important, which doesn't typically happen in a cramped little tea bag.
So we at chinalife suggest you buy loose tea at all times. Check out our no mess, loose tea drinking vessels and get the most out of your cuppa!