First, you have to know that there are two types of Badminton Strings, strings made of natural guts material or synthetic material.
Natural guts strings provide more feel, control and power. It gives out less vibration and is nice to play with. However, they are less durable and more expensive.
Unless you have a higher budget, you may want to use the synthetic ones.
Badminton Strings have different gauge numbers to indicate the thickness or diameter of the strings. Thicker strings will have a lower gauge number. A 20 gauge string is thicker than a 22 gauge one.
Thicker strings are more durable and gives more control but not as powerful. Thinner strings will give you more zip and power but they don’t last long.
A lot of people think that a higher string tension means more power. In fact it’s the opposite that is correct. A higher string tension will give you more control while a lower string tension will give you more power. This is due to the trampoline effect of the strings.
You can go for string tension in between 16lb to 26lb, depending on the strings you use.
Let say you want extra power. What you can do is – Use thin strings at lower tension. Or you could use thin strings at higher tension for a more balance approach.
As you can see, stringing is more like doing arts than math. There is no one common answer for all players. Understand your own style of play, strengths and weaknesses. Then string it accordingly.
Feel it… Test it…