I have been playing badminton(in doors) for past 6 months(3 times a
week). So far I used Willson, Yonex, Carlton cocks. I am still under
the conmfusion which shuttle cocks are suitable for my play. Can you
please suggest which cock & which grade is suitable for me.

I feel that it is all preference and the cost differential that they
have. The Yonex shuttle probably the best overall shuttle as it is
very durable and fairly inexpensive. The Carlton shuttle allow fairly
cheap, does not have the ability to be manovered as well as the Yonex
though. I am not familiar with the Wilson.
 I hope this will help you with your shuttle cock question
                            
                                                  Tanner

Hi,
Welcome to the world of badminton, I am playing badminton from the
past fifteen years. The best indoor  shuttlecock I have come across is
YONEX.

ONE THING NEED TO KEEP IN MIND IS HOW GOOD YOU ARE. If you are a
starter you generally tend to hit a lot of wrong shots or hit with the
rim, this tends to break the feather cocks very easily. I would
suggest you to get yonex synthetic shuttles with cork bottom instead
of plastic bottom, this healps i nthe flight, keeps the rcquet in good
shape and also helps the game. When you decide to buy the synthetic
one keep in mide there are different weights , heavier the shuttle
faster it moves, try to get the one with medium weight so that the
shuttle is play a lot longer and also lets you develop your game.

One you are extrmely confident shift to feather shuttles. One trick to
keep the shuttle feathers from breaking easily is to dip the  feather
par of shuttle in water (upto the thread for a couple of second and
let it dry before using it, this makes the shuttle a lot more reilient
to bad shots.

I hope this helps you, have fun playing. (By the way did u know that
in a well fought game of badminton a player travels as much s 3
miles!!!!)
Cheers!

I think jackal7 has given a very nice answer to the question and i
would like to add a few tips that, you tend to play nicely along with
the synthetic shuttle soon, but the same quality in accuracy and
judgement takes a while with the feather shuttle. So i would advice
you have some control over the feather shuttle too, coz that is the
real game in the long run.

thanks, 
have a wonderful time playing the game.