I have used Persil Color Megaperls, brought home from trips to Germany, for years with superb results. As a test, I recently bought some Persil Power Perls from walmart.com. These are marketed as a "universal" powder (supposedly good for both whites and colors), in part because Americans aren't accustomed to having to buy two sorts of detergent.
My "work clothing" consists of chino trousers in various colors (khaki, olive green, navy blue) and surgical scrub tops, all of which are dark colors: green, wine, navy, etc. Since the fabrics, washing needs, and drying needs are similar, I was my work clothes together, without color sorting. Several weeks ago, I began trying US Persil rather than my German supply. So far, the loads are just as clean. I have one wine-colored top that possibly is fading a bit; I have an identical top that I am keeping in the closet as a "control" to determine in a month or so if the US Persil-washed top indeed is fading.
Nothing faded with German Color Megaperls, but of course the US Power Perl product, while marketed as a one-size-fits-all product, most likely is best for whites and pastels. I wish they'd market an equivalent of Color Megaperls, but Americans are set in their ways and most don't like to stock two kinds of detergent. I hate liquid detergent, I feel powders work best in a FL, and so I don't see the US Persil color liquid as an option for me. Another option is to buy imported Persil Color Megaperls on the internet. Pricey, but I use 15-30 ml (1-2 tbsp) per load, so it lasts a long, long time.