I used to have a Galaxy Tab. After researching I found that the iPad was the better device. I know it's not Android. To me it is the best there is. Especially the iPad Pro.
There is an app called Move to iOS that you install on both devices. Then you connect the 2 and select what you want to transfer. It works well. Used it several times myself.
I always adjust these settings when I get a new device.
Screen brightness
Battery saver mode to on
Turn off location
Turn off wifi when I don't need it
Disable notification. I find them useless anyway.
Dark mode saves power too so I enable it
I also routinely close apps running in the background.