Choosing the right string and tension is very, very important. It is as important as the racket itself.
Take a look at the chart below and choose a string that is more suited for your play. As for the tension, the higher the tension you choose, the harder you will have to swing to get that power.
However, higher string tensions give you much more control of the shuttle.
20lbs - 22lbs.
22lbs. - 24 lbs.
25lbs and up.
Higher Tension -
Lower Tension -
More Repulsion (Power)
WHAT APPROPRIATE STRING
TENSION IS ESSENTIAL FOR?
Playing with the suitable string tension allows you to produce good
power and control in your shots.
String tension that is TOO HIGH can cause injury to your arm. This can possibly cause lead to tennis elbow (common elbow pain from racket sports) and damage to your triceps muscle.
WHAT ARE YOU LOOKING
FOR IN STRING FEEL?
(Extended life of strings, mainly by thickness. Usually ~0.70mm)
(Power =/= Repulsion, but basically, the shuttle will leave your strings faster, which some people attribute to power; usually ~0.68mm)
(You get better touch at the net with the thinner strings, but in general, does not give power due to stiffness in how the string is braided; usually also ~0.68mm) "feels" of the string; usually categorised by how hard or soft the strings feel.
(Easier to generate power through a "trampoline" type feel. Usually doesn't hold tension as well, but plays quite well in higher-ish tensions)
(Overall playability, usually holds tension decently or better)
(Excellent control or touch feels. On medium tension, it will "sound" higher when you hit it. Think of the ping ping sound when you hear people hit the shuttle. Plays better at lower tensions, unless you're strong enough to make the string bed flex like a trampoline feel)