Good brands for badminton strings are: Ashaway, Gosen, Mizuno, Yonex.
The number three unsung hero of badminton equipment is the badminton grip. Similar to the string being the interface to the shuttle, the grip is the interface to the badminton player��s finger and hand. The game of badminton comprises of many very delicate movements and fine control from the player��s finger and wrist. A proper grip ensure that there is proper actuation and feedback to and from the racket.
Badminton rackets comes in two major head shapes: Isometric/square and Oval. Oval is the traditional racket shape, it is a slightly bottom heavy oval, almost the shape of an egg. Oval rackets in general have a small but more concentrated sweet spot. Oval fans like the concentration of power around the sweetspot of the racket. The shape is the Isometric or square which became more popular after the early 1990��s. The Isometric head has a wider and more squared top half of the racket head. The advantage of the isometric is an enlarged sweetspot which give off-centered hit a better response.
As you can see, none of the different properties of the above characteristics are strictly better than other. Some players prefers slightly heavier rackets, some prefer slightly lighter, some like even balanced, some like head balanced. What I want to point out is that ultimately, it is a person's skill level and style that determines what racket is suitable, go try them out if you can to see what fits.