The good news is that, discounting alternate artwork variants we are only missing four cards to make a complete set and all four are of course legendary rare-rated
In short, the look and feel of the cards from Pokmon card condition to finish often differ, with Japanese cards prized for their print quality and aesthetics
Apparently, every one of them believes it is the most important.
Ignition Priority has also been removed, changing the evaluation of cards that used to be susceptible to priority such as Bottomless Trap Hole, and those who used to be able to abuse priority, like Judgment Dragon
Oh, and did I mention that if you draw three cards, lose two cards, and have a Psychatog on the table, you've just grown your 'Tog by +6/+6 (two cards in graveyard + Fact or Fiction + 3 cards in hand -- discard the three cards to have six in the grave, remove all six to give another +3/+3)