The amount of storage you need depends on what you use your device for. 128 GB is good for a phone or a tablet, but for laptops, it’ll slow down if you start to fill it. 256 GB is plenty for general use on a laptop, while 500 GB is better for work or gaming. If you use your laptop/PC for heavy duty work like video editing and digital art or you’re serious about gaming, then you would be better with 1TB.