Although my Oliver hoovers up just about anything and everything, from what I heard from our friends and acquaintances, it is quite common for cats to be very picky about brands and flavours, there are some cats who would ONLY eat a certain flavour from certain make of a certain brand. So I think at this stage you should experiment with smallish containers of many different variations and determine what he prefers. Most of dried food are also nutritionally balanced so if he eats them you shouldn't be worried. As he is still a new arrival to you, some trials and errors are expected!! Hope you find what he likes soon!