powders
I stick to powders, I think they dissolve and rinse better than thick liquids. Powders are also lighter per dose and cost less money/energy to ship. That said, my favorite powders are German/Henkel Megaperls, both Universal and Color. I bring it back from trips to Germany. When I'm ready to break into a new plastic package of Persil, I store it in a Glad food container with airtight lid.
I've purchased, but have yet to open, a package of Persil powder from Walmart. I will try it eventually.
Re: domestically sourced detergents other than US/Walmart Persil, I use Gain HE and Tide HE powders, unscented if possible and if not then the original scent. I don't trust detergents that claim to be for both HE and toploader machines, I doubt one formula can do the best job in both types of machines (so much for Costco house brand). Gain HE powder is not easy to find, but Amazon usually carries it. The downside is that either you have to order a large shipment (like six boxes) or else buy it via Prime Pantry, which requires a $6 delivery charge and which strongly encourages you to fill the box with other products (some of which you may need, some of which you may not need).