When you're buying "promotional loads", it pretty much doesn't matter unless you notice your gun / choke combination has a distinct preference for one over the other.
Same can be said for the difference between 7 1/2 and 8s for either targets or small birds. A miss will still be a miss.
You will notice the difference from the $3.49 shells if you switch to a Remington Premier or Winchester AA ($5.49) load. These pellets contain more antimony in the alloy, making them harder. They deform less and fly truer giver better patterns.