I'm not as familiar with the other two since they're not in the region I live in. But Petco and Petsmart have a lot of great foods.
Both stores, in fact, have their cat foods slightly separated. Nicer foods one aisle, cheaper stuff on another.

Stuff like Purina one, Pro plan, and science diet gets put in the middle.
Your nicer foods like Blue Buffalo, Wellness, etc, tend to be grouped together.
One thing to remember, you don't have to feed only one brand of wet!

So you can try out a few different ones. Though, sticking with one or two drys (mixed) is better for a dry food. If you do switch your kitten's dry food, remember you must do this very very slowly. The higher quality the food you switch to, the slower you'll need to go.
If you're only feeding one, your higher end foods that come in smaller bags (like wellness) could be a great food for you to try out.
I'm having a bit of brain fart at the moment (bluntly put) for listing off who carries what. But all you need to do is check their websites.

There you can find the ingredients for comparison - so you won't find yourself standing around in the store trying to read the tiny label print. You can also price foods this way.
Around my house I have some limiting factors keeping me from trying out too many foods - a kitty with chicken issues, one that needs script urinary food, two others with sensitive stomachs, etc.

For those in my house that can eat it, Taste of the Wild is a nice dry food - high quality and fairly cheap per lb.
Since this is a kitten you should either have him on a good quality kitten food or a good all stages food. Most of your higher end foods are all stages, though.