Delmonte Tomato Ketchup is the best in town. From the number of ketchups I have used, Delmonte has the highest percentage of tomato paste in it, at 29 percent.
Alternate brands that I have considered(and used as well) Heinz, Maggi and Smith & Jones. I picked up Delmonte tomato ketchup at a promotion where it was being sold for Rs. 100, and decided to give it a try. To be honest, all ketchups taste almost the same, but one can tell the amount of actual tomatoes that goes into each of their making. Delmonte scores high on that aspect.
This product is for those who would like to have a superior quality of tomato ketchup and not just go by brand names. A little trivia, most tomato ketchup sachets provided at KFC are delmonte.