From one who has them all.....
Both Persil gel formulas from Germany (Universal and Color variety) have a lighter scent both in bottle and on dried laundry than what is in those blue jugs of "American" Persil sold by Henkel in states. German stuff is more of a fresh clean smell, while American Persil quite bowls one over. Rather like something a cheap tart would wear.... If you don't rinse well, and or over dose your wash will have a powerful odor rather not unlike a cheap knocking shop.
Cleaning power wise remember all TOL and even some MOL laundry detergents are extensively tested to suit local market conditions where sold. Henkel tailored their Persil sold in USA for American market which includes everything from types of soils/stains encountered, water conditions, and fact washing machines here can be anything from 5kg front loaders to large top loading machines.
Use the "color" variety of German Persil for dress shirts, coloured and off white linens... Anything don't want subjected to OBAs and it works a treat.
Where both Universal Persil gel from Germany and what Henkel sells in American market fall short is that neither contain oxygen bleaching systems. As noted by many consumer testing groups (including those in Germany) better results are often obtained with powders that contain bleaching systems, and have found that to be true as well. Fortunately have an ample supply of various oxygen bleaches so that's me for you.
Dosage wise looking at bottles lined up in my stash Persil from Germany has smaller caps compared to that blue jug of American Henkel product. Thus one is more concentrated than the other.
With German Persil gel never go above 15ml or maybe 25ml for a full 5kg gram load of soiled wash. OTOH using recommended dosage of to "1" line in Persil cap will send all my European washing machines (Miele and both AEG Lavamat units) into suds lock. That and it takes many, many rinses to get the stuff out. Even then the scent is powerful and will remain long after drying.
Dosage with American Henkel is tricky, and you have to get things down and sorted, otherwise again as noted above there will be issues IMHO.
Cleaning wise Persil is Persil. Results from German Universal, Color/Kraft and American "Pro Dimensions" of clean are somewhat even across board. Shirt collars and cuffs are clean, whiff from BO is mostly gone from underarm areas, and in general most soils and marks that don't require bleaching are shifted.
Depending upon nature of soiling or mark traces or a bit more of things might remain, but again that IMHO speaks more to nature no liquid product contains bleaching agents.
Am going off liquids, so haven't bothered ordering anything from Europe in a while. Also am passing up American Persil which is frequently on special offer locally. Only thing will keep around is Tide Free and Gentle since it performs well, doesn't have scent, and now doesn't have OBAs either.