Consumer Reports does this rating every year and usually gives Powdered Tide with Bleach the #2 spot. The ratings include: getting clothes the most clean, removing the most stains, and having the least amount of redepositing of dirt on other locations in your laundry.
I buy that instead of the #1 rated product since the scores were similar and since powdered tide is one of the cheapest products. Liquid Tide scores worse and costs a fortune.
There was another product that scored well and also was cheap, but I think that is only sold in one store which isn't available anywhere near me. Was it CostCo? I don't have a non-auto CR magazine near me at work.