Neither the Samsung Galaxy S23 Ultra nor the S21 Ultra are Samsung’s newest models, with the Samsung Galaxy S24 Ultra beating them both. However, both of these older phones are still worth considering if you’re in the market for a new device. The Ultra range has always been the flagship models of their generation, so both models remain decently fast and offer good cameras and excellent displays for all your browsing needs.

If you're looking for a slightly older phone, either is still worth considering. And if you're wondering whether you should upgrade from the S21 Ultra to the S23 Ultra, the answer is yes. In an ideal world, it makes sense to upgrade from a phone released three years ago to one that's only a year old. The real answer is a bit more complicated, though, so it helps to understand what both models have to offer to see whether either is a substantial upgrade for your needs.

At first glance, the Galaxy S23 Ultra and S21 Ultra look very similar. But the S23 Ultra has a touch of a classier design, thanks to refinements like Gorilla Glass Victus 2 and Armor Aluminum, meaning it’s sturdier and feels more expensive, too.

Both phones have 6.8-inch displays, but the S23 Ultra has a wider aspect ratio, so it feels larger than the narrower S21 Ultra. The changes also mean the S23 Ultra weighs a bit more, 8.25oz instead of 8oz. However, you’re already choosing a chunky phone, so it’s not a significant change.