Yeah the X (which I've got on pre-order) is a bit more capable and so while it may be at a disadvantage for storage it is the better unit overall.... I won't need one of these cards for quite some time; I'm going to get a USB3.2 based external SSD for general games and storage and then just transfer games across to the internal drive for Series X games that require it... I don't really have many games on the go, especially newer ones at full price.