Not sure whether you are asking for a recipe or ???? If you are asking for comparisons between Homemade and Commercial ones, then I would say whether the person who makes the Homemade version knows about the balance of taste, which may inevitably make it better than the Commercial ones.
if you are a skilled cook, home made ketchup is going to be better than commercial. you can adjust the taste to suit your self. You are not churning out zillions of bottles of the stuff that need x amount of months/years shelf life, you can concentrate on flavour, not longevity. You have the time to pick over every ingredient for freshness and insects. However, if you're not skilled, buy the stuff from the shops until you've learned how to do it, you don't want any bugs from badly presserved ketchups.
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