Skip It If You Need Tons of Storage
If you think you'll want or need more than 256GB of storage, start looking at other devices.
The Galaxy S10e and Galaxy S10 come with two storage configurations: 128GB or 256GB. Both feature a microSD card slot that can take cards up to 512GB.
The Galaxy S10+ comes with three storage options 128GB/512GB/1TB giving users an unprecedented amount of storage. This in addition to support for up to 512GB of expandable storage via a microSD card slot.
Samsung will only sell one version of the Galaxy S10 5G, a 256GB version. Unfortunately, the 5G model doesn't come with a microSD card slot which means you can't get any additional storage.
256GB is going to be fine for average users but if you're a power user that can easily fill up 256GB with photos, videos, game saves, and other data, you might want to go with one of the other Galaxy S10 variants.