Consumer Reports tests them all. Powdered Tide with Bleach is consistantly at or near the top at getting stains out, preventing stain transfer, and keeping whites/colors looking correct. Plus it is one of the cheapest.
Liquids usually don't do as well as powders in the tests and often liquids cost a lot more. <- general statement, not true in all cases, but usually true.
Just make certain that you add the powder, turn on the water, and then when it is all dissolved add the clothes.