Install Android 10 If You've Got Android Pie Problems
If you're dealing with bugs or performance problems on Android Pie, you might want to install Android 10 right away. It could improve your phone's performance.
Some Galaxy S9 users are noticing improved battery life, better connectivity, and a much smoother user interface.
Android updates, particularly major releases like Android 10, have been known to iron out common performance issues like severe battery drain, reboots, lag, and issues with connectivity (Wi-Fi, Bluetooth, cellular data, GPS) so this doesn't come as a surprise.
If your Samsung Galaxy S9 is tied to a specific carrier, there's a chance your carrier adds additional bug fixes to your upgrade.
Samsung's version of Android 10 also comes with a few changes to Device Care (formerly known as Device Maintenance). These changes could help you get to the bottom of some of your issues a little bit quicker.
For instance, with Android 10 on board, the battery usage graph now provides more detailed information.