The sets who has soft and hard prisms are PPcards. The reason is that you can bought these cards in packs (soft prism) and in other special sets, like with a box, or with a hard case, or with a binder, etc. (hard prisms).
An other problem of some of these collections is that you have numbered prism (PPcard) and LC, PC cards (Hero Collection). That the case of Hero Collection 5 (PPcard11) and 6 (PPcard12). If you bought packs from PPcard, you can have numbered prism (but no LC or HC), and if you bought Hero Collection packs, you can have LC/PC, but no numbered prisms. The regulars are the same. The problem was at the beginning, it exist 2 different publisher, but Hero Collection was bought by PPcards ;p