Cat food and urinary problems?

My male cat has urinary tract problems if he eats certain brands of (cheaper) cat food. We have been feeding him original Lamb & Rice IAMs and since he has had no problems what-so-ever. I am curious if switching to Eukanuba Lamb & Rice will keep him from having urinary problems like IAMs does? Or is there no way... show more My male cat has urinary tract problems if he eats certain brands of (cheaper) cat food. We have been feeding him original Lamb & Rice IAMs and since he has had no problems what-so-ever. I am curious if switching to Eukanuba Lamb & Rice will keep him from having urinary problems like IAMs does? Or is there no way of telling without trying?

Eukanuba and IAMs are both about the same (good) quality cat food; when he was having problems, it was when we fed him very low quality grocery store brand cat-food.
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