I like to use Samsung Messages app. I using as my default SMS app. But one drawback is can't block non number SMS. Nowadays all annoying ad messages coming form non number. I wish Samsung would implement the Block non number messages feature. It will be very helpful. Google Messages app has same feature but I don't like to use any other SMS app. I want to stick with Samsung Messages App.
In device you can also block the number. Hope this helps!