Cat Treats - Dreamies or Ham?

I used to buy ham especially for my cat, as he used to have a slice a day as a treat (he is very spoilt..). I then went round my sisters and found out that her cats LOVE cat treats, so I went out and bought my cat a packet of Cheese Dreamies, and he does seem very interested in them, complete with dribbling on my hand while I'm trying to shake a few nuggets out.. I have switched him to Dreamies now, and don't buy him any ham (although he still tries getting in the fridge for his beloved ham), but after doing some research I am concerned that Dreamies are probably much worse for him than (cheap) ham, as they contain a high number of grain. Should I continue him on Dreamies and just make sure I limit him to 8 nuggets a day like the packet says, or should I go back to ham?