AKA The art of the hidden card.
Magic the Gathering's morph cards and Yu-Gi-Oh's set cards serve one real purpose, threat, a feeling that just isn't there when the cards are hidden in your hand with all the others, that feels more like trying to second guess your opponent. This major difference is directly responsible for the two giants play styles, YGO's removal versus MTG's counter. Is one better than the other? Well, they both feel like a "ha ha, f*ck you" when they go off but there's got to be something there given the popularity both games enjoy. Perhaps this needs to come down to what sort of effects you're willing to allow to go off at instant speed (during P2's turn).