Different strings have different characteristics. Thicker strings usually offer greater durability while thinner strings generally offer better control, but less durability. Thinner strings may offer greater power, provided the player can hit the shuttle in the sweet spot on the racquet. Failing to hit the sweet spot will result in more string breakage.
Lower string tensions generally provide better durability and a larger sweet spot on the racquet. This allows players to hit harder shots more consistently. More advanced players may choose to use a higher string tension to give them more control and power, but the sweet spot on the racquet becomes much smaller and only the best players can consistently hit the sweet spot.
These charts explain the different string characteristics and may help you in choosing the best string and tension for you.
