Samsung Galaxy Note 9 comes with new DeX and that can be its best feature as
Samsung Galaxy S9/S9+ and Note 9 Android 10 update adds Dex for PC support - PiunikaWeb
USB C to HDMI Adapter for Samsung DeX,Desktop Experience for Galaxy S21/S20/S20 FE/Note20/Note10/Note9/TabS7/S7+/S6,DeX Station with HDMI 4K,USB3.0,USB-C Charging,SD/TF Card Reader,Nintendo Switch : Amazon.com.au: Computers
Samsung DeX + Galaxy Note9: Transform Any Space into a Productive Workplace - Samsung US Newsroom
Galaxy Note 9 Will Be Able to Get Hooked to an External Monitor Without Requiring an Expensive DeX Accessory