Over Walmart brand or over Walmart and usp?
Test Powder is great Ive been on it stacked with Erase Pro for the past week and have had some huge pumps thanks in part to the Test Powder and have already dropped a fair amount of water (likely from the erase pro).
I would go with a top tier product like TP over getting my supps at Wal-Mart, personally.
I've had nothing but bad experiences with supps from Walmart. It's worth it to do a quick search on Amazon or an online retailer. You can find it cheaper and more than likely better quality by doing some searches online.