In my experience, whenever I'm in a store that sells cat grass, they only ever sell any one brand, and they're all okay to me. I have no particular preference. My cats will eat it regardless of what brand it is.
What they sell in pet stores is just wheat grass (the same thing they make wheat grass shots out of). Health food stores sell wheat grass and it's less expensive. Otherwise you can buy fresh grass or seeds at pet stores.
I have spider plants. They are not harmful to cats - are damn near impossible to kill, and they multiply like crazy, (so you'll have plenty of new plants after the others are eaten.) The special cat grass didn't thrill my cats. The spiders plants they love.
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