Sir only use NGK original. Cost approx 9k in open market and 14k from dealership. If you like to use relatively economic one, go for brisk (made in Czech republic). If you are from Islamabad/RWP, then available at waqar autos for 4.5k
I have recently changed plugs of my city and I was fortunate enough to get NGK original. Although, market is rich in fake ones. I will strongly recommend you to consider brisk plugs. Check their website and you shall have answer to many of your questions.