The switch will be the first "handheld" to have vibration built in. also since the controller will be the same from console to handheld, the quality of the controls will be the best (subjectively) of any handheld to date. Also this will be the first console handheld or otherwise to use a current universal port (usb c) which android phones and many laptops are adopting. This means people could plug their switch into the charger by their bedside where they charge their phone rather than have a dedicated nintendo branded brick to carry around.
edit: also first handheld with a kickstand for whatever thats worth
These features are really exciting to me and i want to know what you guys think.