Budget
Before anything else, you’ll want to figure out how much you’re willing to spend on a Watch Series 9 case. Value-priced cases continue to improve, so you can find a decent case for less than $15. But if you’re looking for a more premium model, you’ll likely have to pay more than $40 and even more for case and band combinations.
Protection
If you have the ideal case on, you can protect your watch — and your heart — from some damage. Because not only is that great for keeping your watch safe, but it also helps retain trade-in (or sale) value when it’s time to upgrade your watch to the new Series 10.
Size
Your perfect Apple Watch Series 9 case should match the size you bought — either 41-millimeter or 45-millimeter. Keep in mind that a case for one size won’t fit the other, so picking up a case with the right size matters for the protection of your watch.
Do you want a clear case?
Clear cases are popular because they show off your Apple Watch (and its color). Clear cases, especially cheaper ones, can become less clear over time and slowly start to yellow. Many case makers now add UV protection to their clear cases to prevent yellowing.
